OK
https://use-application-dns.net/
Websites
Runtime: 1.6s
On December 04, 2024, 07:57 AM UTC, https://use-application-dns.net/ was accessible when tested on AS51896 in Iceland.
Failures
HTTP Experiment
null
DNS Experiment
null
Control
null
DNS Queries
Resolver:
45.134.88.121
Query:
IN A use-application-dns.net
Engine:
system
Name
Class
TTL
Type
DATA
@
IN
A
35.190.14.201
TCP Connections
Connection to 35.190.14.201:443 succeeded.
HTTP Requests
URL
GET https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet
Response Headers
Alt-Svc:h3=":443"; ma=2592000,h3-29=":443"; ma=2592000Cache-Control:max-age=0, no-cache, no-store, must-revalidate, privateContent-Language:en-USContent-Length:84306Content-Security-Policy:font-src 'self' https://*.webservices.mozgcp.net; img-src 'self' blob: data: https://*.mozaws.net https://*.webservices.mozgcp.net https://*.google-analytics.com https://profile.accounts.firefox.com https://firefoxusercontent.com http://www.gravatar.com https://www.gravatar.com https://secure.gravatar.com https://i1.wp.com https://mozillausercontent.com; form-action 'self' https://accounts.firefox.com https://accounts.stage.mozaws.net; connect-src 'self' https://*.google-analytics.com https://location.services.mozilla.com https://accounts.firefox.com/metrics-flow https://accounts.stage.mozaws.net/metrics-flow https://basket.mozilla.org https://releases.wagtail.org; manifest-src https://support.allizom.org https://support.mozilla.org; default-src 'none'; media-src 'self' https://*.webservices.mozgcp.net; script-src 'self' https://*.mozilla.org https://*.webservices.mozgcp.net https://*.google-analytics.com https://*.googletagmanager.com https://pontoon.mozilla.org https://*.jsdelivr.net; style-src 'self' https://*.webservices.mozgcp.net https://*.jsdelivr.net; frame-src 'self' https://*.youtube.comContent-Type:text/html; charset=utf-8Cross-Origin-Opener-Policy:same-originDate:Wed, 04 Dec 2024 07:57:30 GMTExpires:Wed, 04 Dec 2024 07:57:30 GMTReferrer-Policy:strict-origin-when-cross-originServer:gunicornSet-Cookie:session_id=3rqzwks435asod4x64opgwi01uvfuvip; expires=Wed, 01 Jan 2025 07:57:30 GMT; HttpOnly; Max-Age=2419200; Path=/; SameSite=Lax; SecureStrict-Transport-Security:max-age=31536000Via:1.1 googleX-Backend-Server:gha-sumo-web-7fd95558f8-pcvg5.prod.webservices.mozgcp.netX-Content-Type-Options:nosniffX-Frame-Options:DENYX-Robots-Tag:noodp
Response Body
<!DOCTYPE html> <html class="no-js" lang="en-US" dir="ltr" data-gtm-container-id="G-2VC139B3XV" data-ga-content-group="kb-article" data-ga-default-slug="canary-domain-use-application-dnsnet" data-ga-article-locale="en-US" data-ga-topics="/advanced-and-experimental-features/" data-ga-products="/firefox/" > <head> <!-- Read more about our custom configuration and use of Google Analytics here: https://bugzilla.mozilla.org/show_bug.cgi?id=1122305#c8 --> <!-- Google Tag Manager --> <script src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/gtm-snippet.1c0037a49b66fb06.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script> <!-- End Google Tag Manager --> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title> Canary domain - use-application-dns.net | Firefox Help </title> <link rel="apple-touch-icon" sizes="180x180" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/apple-touch-icon.bdc11b610d791a16.png"> <link rel="icon" type="image/png" sizes="32x32" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon-32x32.2143cdf0c7e3f377.png"> <link rel="icon" type="image/png" sizes="16x16" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon-16x16.352a0a2cef154dda.png"> <link rel="manifest" href="/manifest.json"> <link rel="shortcut icon" href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/favicon.03d97697df808c0e.ico"> <meta name="theme-color" content="#ffffff"> <link rel="search" type="application/opensearchdescription+xml" title="Mozilla Support" href="/en-US/search/xml"/> <link href="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/screen.7c7f344f96f6c2a7.css" rel="stylesheet" nonce="zVwpTBF2+08/J+uMf1xvug=="> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/620.c017de8a3c1e20cf.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.a856f1c1afbd9b67.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/566.de80f82c1815ff6e.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/467.e805b3b5a73440ca.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/document.58bdb8f917cf5fd3.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script> <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.fx.download.6e0d6173cf4fde5d.js" nonce="zVwpTBF2+08/J+uMf1xvug=="></script> <meta name="description" content="Network administrators may configure their networks to modify DNS requests for the following special-purpose domain, called a ''canary domain''."/> <meta name="google-site-verification" content="2URA-2Y9BeYYUf8B2BSsBSVetJJS3TZwlXBOaMx2VfY" /> <meta name="google-site-verification" content="ueNbCgS4e1JIAgLGwufm-jHaIcLXFLtFMmR_65S1Ag0" /> <meta name="msvalidate.01" content="1659173DC94819093068B0ED7C51C527" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" /> <link rel="canonical" href="https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet" /> </head> <body class="html-ltr logged-out responsive document en-US" data-readonly="false" data-usernames-api="/en-US/users/api/usernames" data-messages-api="/en-US/messages/api/autocomplete" data-media-url="https://assets-prod.sumo.prod.webservices.mozgcp.net/" data-document-id="46296" > <ul class="sumo-nav-access" id="nav-access"> <li><a href="#main-content">Skip to main content</a></li> <li><a href="/en-US/locales">Switch language</a></li> <li><a id="skip-to-search" href="#search-q">Skip to search</a></li> </ul> <div class="media-test"></div> <div id="announcements"> <div id="announce-geoip-suggestion" class="mzp-c-notification-bar mzp-t-warning"> <button class="mzp-c-notification-bar-button close-button" data-close-id="announce-geoip-suggestion" type="button" data-close-memory="remember" data-close-type="remove" > </button> <p></p> </div> </div> <header class="mzp-c-navigation sumo-nav"> <div class="mzp-c-navigation-l-content"> <div class="sumo-nav--container"> <div class="sumo-nav--logo"> <a href="/en-US/"><img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/mozilla-support.c4f961a8d7b1d501.svg" alt="Mozilla Support Logo"/></a> </div> <button data-mobile-nav-search-button class="sumo-nav--search-button" type="button">Search</button> <button data-sumo-toggle-nav="#main-navigation" class="sumo-nav--toggle-button" type="button" aria-controls="main-navigation">Menu</button> <a class="sumo-nav--avatar-button" data-sumo-toggle-nav="#profile-navigation" aria-controls="profile-navigation" aria-role="button"> <img class="avatar" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/default-FFA-avatar.2f8c2a0592bda1c5.png" alt="Avatar for Username"> </a> <div class="mzp-c-navigation-items sumo-nav--list-wrap" id="main-navigation"> <div class="mzp-c-navigation-menu"> <nav class="mzp-c-menu mzp-is-basic"> <ul class="mzp-c-menu-category-list sumo-nav--list"> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title sumo-nav--link" href="/en-US/questions/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-help">Explore Help Articles</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-help"> <div class="sumo-nav--dropdown-container"> <div class="sumo-nav--dropdown-grid"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-example">Close Firefox menu</button> <div class="sumo-nav--dropdown-col"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <g transform="translate(3 3)" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round"> <rect stroke-linejoin="round" width="18" height="18" rx="2" /> <path d="M4 5h10M4 9h10M4 13h4" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Explore by product</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/products/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-browser.product-home", "link_detail": "firefox" }'> Firefox desktop </a> </li> <li> <a href="/en-US/products/firefox-private-network-vpn" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.mozilla-vpn.product-home", "link_detail": "firefox-private-network-vpn" }'> Mozilla VPN </a> </li> <li> <a href="/en-US/products/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-ios.product-home", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/products/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.thunderbird.product-home", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/products/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.firefox-for-android.product-home", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a class="color-link" href="/en-US/products/" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.browse-all-articles.list-products"}'> View all products </a> </li> </ul> </section> </div> <div class="sumo-nav--dropdown-col"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <g transform="translate(3 3)" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round"> <rect stroke-linejoin="round" width="18" height="18" rx="2" /> <path d="M4 5h10M4 9h10M4 13h4" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Explore by topic</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/topics/settings" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "settings" }'> Settings </a> </li> <li> <a href="/en-US/topics/installation-and-updates" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "installation-and-updates" }'> Installation and updates </a> </li> <li> <a href="/en-US/topics/email-and-messaging" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "email-and-messaging" }'> Email and messaging </a> </li> <li> <a href="/en-US/topics/performance-and-connectivity" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "performance-and-connectivity" }'> Performance and connectivity </a> </li> <li> <a href="/en-US/topics/privacy-and-security" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "privacy-and-security" }'> Privacy and security </a> </li> <li> <a href="/en-US/topics/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.topic-home", "link_detail": "browse" }'> Browse </a> </li> </ul> </section> </div> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title sumo-nav--link" href="#" aria-haspopup="true" aria-controls="mzp-c-menu-panel-tools">Community Forums</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-tools"> <div class="sumo-nav--dropdown-container"> <div class="sumo-nav--dropdown-grid"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-example">Close Firefox menu</button> <div class="sumo-nav--dropdown-col"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <g stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"> <path d="M17 17l-1.051 3.154a1 1 0 01-1.898 0L13 17H5a2 2 0 01-2-2V5a2 2 0 012-2h14a2 2 0 012 2v10a2 2 0 01-2 2h-2zM7 8h10M7 12h10" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Browse by product</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/questions/firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "desktop" }'> Firefox desktop </a> </li> <li> <a href="/en-US/questions/focus-firefox" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "focus" }'> Firefox Focus </a> </li> <li> <a href="/en-US/questions/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/questions/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/questions/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a class="color-link" href="/en-US/questions/" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "view-all-home" }'> View all forums </a> </li> </ul> </section> </div> <div class="sumo-nav--dropdown-col"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <path d="M10.5 9.5L3 17c-1 1.667-1 3 0 4s2.333.833 4-.5l7.5-7.5c2.333 1.054 4.333.734 6-.96 1.667-1.693 1.833-3.707.5-6.04l-3 3-2.5-.5L15 6l3-3c-2.333-1.333-4.333-1.167-6 .5-1.667 1.667-2.167 3.667-1.5 6z" stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round" /> </svg> <h4 class="mzp-c-menu-item-title">Browse all forum threads by topic</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist"> <li> <a href="/en-US/questions/topic/settings" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "settings" }'> Settings </a> </li> <li> <a href="/en-US/questions/topic/installation-and-updates" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "installation-and-updates" }'> Installation and updates </a> </li> <li> <a href="/en-US/questions/topic/email-and-messaging" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "email-and-messaging" }'> Email and messaging </a> </li> <li> <a href="/en-US/questions/topic/performance-and-connectivity" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "performance-and-connectivity" }'> Performance and connectivity </a> </li> <li> <a href="/en-US/questions/topic/privacy-and-security" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "privacy-and-security" }'> Privacy and security </a> </li> <li> <a href="/en-US/questions/topic/browse" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.support-forum-home", "link_detail": "browse" }'> Browse </a> </li> </ul> </section> </div> </div> </div> </div> </li> <li class="mzp-c-menu-category mzp-has-drop-down mzp-js-expandable"> <a class="mzp-c-menu-title sumo-nav--link" href="/en-US/questions/" aria-haspopup="true" aria-controls="mzp-c-menu-panel-help">Ask a Question</a> <div class="mzp-c-menu-panel mzp-has-card" id="mzp-c-menu-panel-help"> <div class="sumo-nav--dropdown-container"> <div class="sumo-nav--dropdown-grid"> <button class="mzp-c-menu-button-close" type="button" aria-controls="mzp-c-menu-panel-example">Close Firefox menu </button> <div class="sumo-nav--dropdown"> <section class="mzp-c-menu-item mzp-has-icon sumo-nav--dropdown-item"> <div class="mzp-c-menu-item-head"> <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"> <g stroke="#000" stroke-width="2" fill="none" fill-rule="evenodd" stroke-linecap="round" stroke-linejoin="round"> <path d="M11 3H4a2 2 0 00-2 2v12a2 2 0 002 2h9l2 4 2-4h2a2 2 0 002-2v-6" /> <path d="M17.5 2.5a2.121 2.121 0 013 3L13 13l-4 1 1-4 7.5-7.5z" /> </g> </svg> <h4 class="mzp-c-menu-item-title">Get help with</h4> </div> <ul class="mzp-c-menu-item-list sumo-nav--sublist-aaq"> <li> <a href="/en-US/questions/new/desktop" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "desktop" }'> Firefox desktop </a> </li> <li> <a href="/en-US/questions/new/firefox-enterprise" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "firefox-enterprise" }'> Firefox for Enterprise </a> </li> <li> <a href="/en-US/questions/new/relay" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "relay" }'> Firefox Relay </a> </li> <li> <a href="/en-US/questions/new/thunderbird" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "thunderbird" }'> Thunderbird </a> </li> <li> <a href="/en-US/questions/new/ios" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "ios" }'> Firefox for iOS </a> </li> <li> <a href="/en-US/questions/new/focus" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "focus" }'> Firefox Focus </a> </li> <li> <a href="/en-US/questions/new/monitor" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "monitor" }'> Monitor </a> </li> <li> <a href="/en-US/questions/new/mozilla-account" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mozilla-account" }'> Mozilla Account </a> </li> <li> <a href="/en-US/questions/new/mobile" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "mobile" }'> Firefox for Android </a> </li> <li> <a href="/en-US/questions/new/firefox-private-network-vpn" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "firefox-private-network-vpn" }'> Mozilla VPN </a> </li> <li> <a href="/en-US/questions/new/pocket" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-2", "link_detail": "pocket" }'> Pocket </a> </li> <li> <a class="color-link" href="/en-US/questions/new" data-event-name="link_click" data-event-parameters='{ "link_name": "main-menu.aaq-step-1", "link_detail": "view-all" }'> View all </a> </li> </ul> </section> </div> </div> </div> </div> </li> <li class="mzp-c-menu-category"> <a class="mzp-c-menu-title sumo-nav--link" href="/en-US/contribute" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.contribute.contribute-home"}'> Contribute </a> </li> </ul> </nav> </div> </div> <div class="mzp-c-navigation-items sumo-nav--list-wrap-right logged-out" id="profile-navigation"> <div class="mzp-c-navigation-menu"> <nav class="mzp-c-menu mzp-is-basic"> <ul class="mzp-c-menu-category-list sumo-nav--list"> <li class="mzp-c-menu-category sumo-nav--item-right"> <form data-instant-search="form" id="support-search" action="/en-US/search/" method="get" class="simple-search-form"> <input type="hidden" name="product" value="firefox" /> <input spellcheck="true" type="search" autocomplete="off" name="q" aria-required="true" placeholder="Search questions, articles, or topics (example: saving passwords in Firefox)" class="searchbox" id="search-q" /> <button type="submit" title="Search" class="search-button">Search</button> </form> </li> <li class="mzp-c-menu-category logged-out-button-row "> <a rel="nofollow" href="/en-US/users/auth" class="sumo-button secondary-button button-lg" data-event-name="link_click" data-event-parameters='{"link_name": "main-menu.sign-in-up"}'> Sign In/Up </a> </li> </ul> </nav> </div> 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23.0, "visible": false}, {"name": "Version 21", "slug": "fx21", "product": "firefox", "default": false, "min_version": 21.0, "max_version": 22.0, "visible": false}, {"name": "Version 20", "slug": "fx20", "product": "firefox", "default": false, "min_version": 20.0, "max_version": 21.0, "visible": false}, {"name": "Version 19", "slug": "fx19", "product": "firefox", "default": false, "min_version": 19.0, "max_version": 20.0, "visible": false}, {"name": "Version 18", "slug": "fx18", "product": "firefox", "default": false, "min_version": 18.0, "max_version": 19.0, "visible": false}, {"name": "Version 17 (ESR)", "slug": "fx17", "product": "firefox", "default": false, "min_version": 17.0, "max_version": 18.0, "visible": false}, {"name": "Version 16", "slug": "fx16", "product": "firefox", "default": false, "min_version": 16.0, "max_version": 17.0, "visible": false}, {"name": "Version 15", "slug": "fx15", "product": "firefox", "default": false, "min_version": 15.0, "max_version": 16.0, "visible": false}, {"name": "Version 14", "slug": "fx14", "product": "firefox", "default": false, "min_version": 14.0, "max_version": 15.0, "visible": false}, {"name": "Version 13", "slug": "fx13", "product": "firefox", "default": false, "min_version": 13.0, "max_version": 14.0, "visible": false}, {"name": "Version 12", "slug": "fx12", "product": "firefox", "default": false, "min_version": 12.0, "max_version": 13.0, "visible": false}, {"name": "Version 11", "slug": "fx11", "product": "firefox", "default": false, "min_version": 11.0, "max_version": 12.0, "visible": false}, {"name": "Version 10 (ESR)", "slug": "fx10", "product": "firefox", "default": false, "min_version": 10.0, "max_version": 11.0, "visible": false}, {"name": "Version 9", "slug": "fx9", "product": "firefox", "default": false, "min_version": 9.0, "max_version": 10.0, "visible": false}, {"name": "Version 8", "slug": "fx8", "product": "firefox", "default": false, "min_version": 8.0, "max_version": 9.0, "visible": false}, {"name": "Version 7", "slug": "fx7", "product": "firefox", "default": false, "min_version": 7.0, "max_version": 8.0, "visible": false}, {"name": "Version 6", "slug": "fx6", "product": "firefox", "default": false, "min_version": 6.0, "max_version": 7.0, "visible": false}, {"name": "Version 5", "slug": "fx5", "product": "firefox", "default": false, "min_version": 5.0, "max_version": 6.0, "visible": false}, {"name": "Version 4", "slug": "fx4", "product": "firefox", "default": false, "min_version": 4.0, "max_version": 5.0, "visible": false}, {"name": "Version 117", "slug": "fx117", "product": "firefox", "default": false, "min_version": -1.0, "max_version": 1.0, "visible": false}]}, "platforms": {"firefox": [{"name": "Linux", "slug": "linux", "visible": true}, {"name": "Mac", "slug": "mac", "visible": true}, {"name": "Windows XP", "slug": "winxp", "visible": true}, {"name": "Windows 7/Vista", "slug": "win7", "visible": true}, {"name": "Windows 8", "slug": "win8", "visible": true}, {"name": "Windows 10", "slug": "win10", "visible": true}, {"name": "Windows 11", "slug": "win11", "visible": true}]}} </script> <h3 class="sidebar-subheading force-top-margin">Customize this article</h3> <div class="product" data-product="firefox"> <div class="field checkbox is-condensed"> <input type="checkbox" id="id_firefox" checked value="product:firefox" /> <label for="id_firefox">Firefox</label> </div> <div class="selectbox-wrapper"> <select class="version"> <option value="version:fx135" data-min="135.0" data-max="136.0" > Version 135 </option> <option value="version:fx134" data-min="134.0" data-max="135.0" > Version 134 </option> <option value="version:fx133" data-min="133.0" data-max="134.0" selected> Version 133 </option> <option value="version:fx132" data-min="132.0" data-max="133.0" > Version 132 </option> <option value="version:fx131" data-min="131.0" data-max="132.0" > Version 131 </option> <option value="version:fx130" data-min="130.0" data-max="131.0" > Version 130 </option> <option value="version:fx129" data-min="129.0" data-max="130.0" > Version 129 </option> <option value="version:fx128" data-min="128.0" data-max="129.0" > Version 128 </option> <option value="version:fx127" data-min="127.0" data-max="128.0" > Version 127 </option> <option value="version:fx126" data-min="126.0" data-max="127.0" > Version 126 </option> <option value="version:fx125" data-min="125.0" data-max="126.0" > Version 125 </option> <option value="version:fx124" data-min="124.0" data-max="125.0" > Version 124 </option> <option value="version:fx123" data-min="123.0" data-max="124.0" > Version 123 </option> <option value="version:fx122" data-min="122.0" data-max="123.0" > Version 122 </option> <option value="version:fx121" data-min="121.0" data-max="122.0" > Version 121 </option> <option value="version:fx120" data-min="120.0" data-max="121.0" > Version 120 </option> <option value="version:fx119" data-min="119.0" data-max="120.0" > Version 119 </option> <option value="version:fx118" data-min="118.0" data-max="119.0" > Version 118 </option> <option value="version:fx117" data-min="117.0" data-max="118.0" > Version 117 </option> <option value="version:fx116" data-min="116.0" data-max="117.0" > Version 116 </option> <option value="version:fx115" data-min="115.0" data-max="116.0" > Version 115 </option> </select> </div> <div class="selectbox-wrapper"> <select class="platform"> <option value="platform:win8" > Windows 8 </option> <option value="platform:win7" > Windows 7/Vista </option> <option value="platform:winxp" > Windows XP </option> <option value="platform:mac" > Mac </option> <option value="platform:linux" > Linux </option> <option value="platform:win10" > Windows 10 </option> <option value="platform:win11" > Windows 11 </option> </select> </div> </div> </section> </li> </ul> </li> </ul> </nav> <div class="document-vote--sidebar-wrap"> <div class="document-vote elevation-01 text-center"> <form class="document-vote--form helpful" action="/en-US/kb/canary-domain-use-application-dnsnet/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='WVF0M4fZRleRkWk9yaBK1otYLXym0OmDHmrUKRIuSBUqEbBugQ23sTJ9rz5tCFaG' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="241813" /> <input type="hidden" name="source" value="footer" /> <button type="submit" class="btn helpful-button" name="helpful"><span class="hidden-text">Yes</span>👍</button> <button type="submit" class="btn not-helpful-button" name="not-helpful"><span class="hidden-text">No</span>👎</button> <img class="wait" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/spinner.18d6c26adc937688.gif" alt="Please wait..." /> </div> </form> </div> </div> </aside> <main role="main" class="sumo-l-two-col--main"> <section id="document-list"> <header class="sumo-article-header kb-header"> <div class="sumo-article-header--text"> <div class="documents-product-title"> <a href="/en-US/products/firefox" title="Firefox"> <img src="https://assets-prod.sumo.prod.webservices.mozgcp.net/media/uploads/products/2020-04-14-08-36-13-8dda6f.png" height="48" width="48" alt="" /> </a> <div class="firefox-download-button hidden"> <div class="download-buttons"> <div class="download-firefox"> <a href="https://www.mozilla.org/firefox/new/?utm_source=support.mozilla.org&utm_medium=referral&utm_campaign=non-fx-button&utm_content=body-download-button" class="download-button sumo-button primary-button button-lg"> Download Firefox </a> <ul class="download-info text-body-xs"> <li><a href="https://www.mozilla.org/firefox/all/">Systems and Languages</a></li> <li><a href="https://www.mozilla.org/firefox/notes">What's New</a></li> <li><a href="https://www.mozilla.org/legal/privacy/firefox">Privacy</a></li> </ul> </div> </div> </div> </div> <h1 class="sumo-page-heading">Canary domain - use-application-dns.net</h1> </div> </header> <article class="wiki-doc"> <div id="document_metadata" class="has-border-bottom"> <span class="product tooltip-container"> Firefox <span class="tooltip">Firefox</span> </span> <span class="last-updated"> <img class="pencil" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/pencil.e33c563f24c4f989.svg" /> <strong>Last updated:</strong> <span class="time"> <time datetime="2022-04-16T05:20:47-07:00">4/16/22</time> </span> </span> <span class="helpful-info"> <img class="thumbsup" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/thumbs-up.2cbd5d41625a84a7.svg"/><span class="helpful-count">62%</span> of users voted this helpful </span> </div> <section id="doc-content" class="document--content "> <p>To signal that their local DNS resolver implements special features that make the network unsuitable for <a href="https://wikipedia.org/wiki/DNS_over_HTTPS">DNS-over-HTTPS</a> (DoH), network administrators may configure their networks to modify DNS requests for the following special-purpose domain, called a <em>canary domain</em>: <strong><a href="http://use-application-dns.net">use-application-dns.net</a></strong>. </p> <div class="note"><strong>Note:</strong> The canary domain only applies to users who have DoH enabled as the default option. It does not apply for users who have made the choice to turn on DoH by themselves.</div> <p>Firefox will attempt to resolve this domain using the DNS server(s) configured in the operating system of the device, and examine the result. The result will be considered <strong>negative</strong> if: </p> <ul><li>A response code other than NOERROR is returned, such as NXDOMAIN (non-existent domain) or SERVFAIL. </li><li>A NOERROR response code is returned, but contains neither A nor AAAA records. </li></ul> <p>The result will be considered <strong>positive</strong> if the query completes with NOERROR and contains A or AAAA records (or both). </p><p>A negative result will be a signal to disable application DNS, (i.e., DoH). </p><p>The use of this domain is specified by Mozilla, as a limited-time measure until a method for signaling the presence of DNS-based content filtering is defined and adopted by an Internet standards body. </p> <div class="note"><strong>Note:</strong> Some existing DNS filtering providers implement similar domains for users to verify that filtering is working. This canary domain differs by being intended to be checked by software such as Firefox, rather than checked explicitly by the user, and by working across filtering providers.</div> </section> <p class="share-link"> <br/> Share this article: <a href="https://mzl.la/3Q9672V">https://mzl.la/3Q9672V</a> </p> </article> <section class="sumo-page-section hide-on-large"> <div class="document-vote elevation-01 text-center"> <form class="document-vote--form helpful" action="/en-US/kb/canary-domain-use-application-dnsnet/vote" method="post"> <input type='hidden' name='csrfmiddlewaretoken' value='WVF0M4fZRleRkWk9yaBK1otYLXym0OmDHmrUKRIuSBUqEbBugQ23sTJ9rz5tCFaG' /> <h4 class="document-vote--heading">Was this article helpful?</h4> <div class="document-vote--buttons"> <input type="hidden" name="revision_id" value="241813" /> <input type="hidden" name="source" value="footer" /> <button type="submit" class="btn helpful-button" name="helpful"><span class="hidden-text">Yes</span>👍</button> <button type="submit" class="btn not-helpful-button" name="not-helpful"><span class="hidden-text">No</span>👎</button> <img class="wait" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/spinner.18d6c26adc937688.gif" alt="Please wait..." /> </div> </form> </div> </section> <section id="doc-contributors" class="document--contributors sumo-page-section"> <p class="help-title text-body-md">These fine people helped write this article:</p> <div class="document--contributors-list text-body-xs"><a class="user secondary-color" rel="nofollow" href="/en-US/user/AliceWyman/">AliceWyman</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/Mozinet/">Mozinet</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/heyjoni/">Joni</a>, <a class="user secondary-color" rel="nofollow" href="/en-US/user/anlazar/">Angela Lazar</a></div> </section> <section class="sumo-page-section"> <div class="card card--callout is-full-width has-moz-headings"> <div class="card--callout-wrap-narrow"> <img class="card--feature-img" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/volunteer.a3be8d331849774b.png" alt="Illustration of hands" /> <div class="card--details"> <h3 class="card--title">Volunteer</h3> <p class="card--desc">Grow and share your expertise with others. 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URL
GET https://use-application-dns.net/
Response Headers
Alt-Svc:h3=":443"; ma=2592000,h3-29=":443"; ma=2592000Content-Length:162Content-Type:text/htmlDate:Wed, 04 Dec 2024 07:57:29 GMTLocation:https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnetServer:nginxStrict-Transport-Security:max-age=60; includeSubDomainsVia:1.1 google
Response Body
<html> <head><title>301 Moved Permanently</title></head> <body> <center><h1>301 Moved Permanently</h1></center> <hr><center>nginx</center> </body> </html>
Resolver
Resolver ASN
AS34927
Resolver IP
45.134.88.121
Resolver Network Name
iFog GmbH
Report ID
20241204T075514Z_webconnectivity_IS_51896_n1_6a9w023v5oHWcSvk
Platform
windows
Software Name
ooniprobe-desktop-unattended (3.14.1)
Measurement Engine
ooniprobe-engine (3.14.1)