OK
https://use-application-dns.net/
Japan
Country
Network
September 19, 2024, 03:36 PM UTC
Date & Time
Websites
Websites
Runtime: 2s
On September 19, 2024, 03:36 PM UTC, https://use-application-dns.net/ was accessible when tested on AS4713 in Japan.

Failures

HTTP Experiment
null
DNS Experiment
null
Control
null

DNS Queries

Resolver:
211.16.9.167
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=2592000
Cache-Control:
max-age=0, no-cache, no-store, must-revalidate, private
Content-Language:
en-US
Content-Length:
82787
Content-Security-Policy:
manifest-src https://support.allizom.org https://support.mozilla.org; script-src 'self' https://*.mozilla.org https://*.webservices.mozgcp.net https://*.google-analytics.com https://*.googletagmanager.com https://pontoon.mozilla.org https://*.jsdelivr.net; form-action 'self' https://accounts.firefox.com https://accounts.stage.mozaws.net; style-src 'self' https://*.webservices.mozgcp.net https://*.jsdelivr.net; default-src 'none'; frame-src 'self' https://*.youtube.com; 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; font-src 'self' https://*.webservices.mozgcp.net; media-src 'self' https://*.webservices.mozgcp.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
Content-Type:
text/html; charset=utf-8
Cross-Origin-Opener-Policy:
same-origin
Date:
Thu, 19 Sep 2024 15:36:16 GMT
Expires:
Thu, 19 Sep 2024 15:36:16 GMT
Referrer-Policy:
strict-origin-when-cross-origin
Server:
gunicorn
Set-Cookie:
session_id=cj47r588slxw8nqww7h926twzhrwxakc; expires=Thu, 17 Oct 2024 15:36:16 GMT; HttpOnly; Max-Age=2419200; Path=/; SameSite=Lax; Secure
Strict-Transport-Security:
max-age=31536000
Via:
1.1 google
X-Backend-Server:
gha-sumo-web-6cf4bf65db-n7n25.prod.webservices.mozgcp.net
X-Content-Type-Options:
nosniff
X-Frame-Options:
DENY
X-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="71meQZYGJuBqde2tMoCFbQ=="></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.e5ee3de9b1d91ac3.css" rel="stylesheet" nonce="71meQZYGJuBqde2tMoCFbQ==">

  
  
  <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/620.c017de8a3c1e20cf.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.32b869b96000f2b5.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script>
  
    <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/566.a4f2fdf2c8c0d052.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/467.5a70109f04462deb.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script><script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/document.a5ec6efb9a950a32.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script>
  
  <script defer="defer" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/common.fx.download.6e0d6173cf4fde5d.js" nonce="71meQZYGJuBqde2tMoCFbQ=="></script>

  
    
      <meta name="description" content="Network administrators may configure their networks to modify DNS requests for the following special-purpose domain, called a &#39;&#39;canary domain&#39;&#39;."/>
    
  

  
  <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">
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    <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>
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        <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">
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              <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>
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            <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>
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                <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">
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              <svg class="mzp-c-menu-item-icon" width="24" height="24" xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 24 24">
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                  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"
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              <h4 class="mzp-c-menu-item-title">Browse all forum threads by topic</h4>
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          data-event-name="link_click"
          data-event-parameters='{
          "link_name": "main-menu.support-forum-home",
          "link_detail": "settings"
        }'>
          Settings
      </a>
    </li>
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      <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='{
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        <h1 class="sumo-page-heading">Canary domain - use-application-dns.net</h1>
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      <img class="pencil" src="https://assets-prod.sumo.prod.webservices.mozgcp.net/static/pencil.e33c563f24c4f989.svg" /> <strong>Last updated:</strong> <span class="time">04/16/2022</span>
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      <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>
    
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                Explore Help Articles
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</body>
</html>
URL
GET https://use-application-dns.net/
Response Headers
Alt-Svc:
h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
Content-Length:
162
Content-Type:
text/html
Date:
Thu, 19 Sep 2024 15:36:15 GMT
Location:
https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet
Server:
nginx
Strict-Transport-Security:
max-age=60; includeSubDomains
Via:
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
AS4713
Resolver IP
211.16.9.167
Resolver Network Name
<unknown>
Report ID
20240919T153501Z_webconnectivity_JP_4713_n1_7flnPBstgjXFB6cV
Platform
linux
Software Name
iThena-ooniprobe (1.0.0)
Measurement Engine
ooniprobe-engine (3.10.0-beta.3)

Raw Measurement Data

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