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Submitted URL:
http://use-application-dns.net/
Effective URL:
https://support.mozilla.org/en-US/kb/canary-domain-use-application-dnsnet
Submission: On December 15 via manual (December 15th 2023, 2:29:24 pm UTC) from SG — Scanned from SG

Form analysis
7 forms found in the DOM

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GET /en-US/search/

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GET /en-US/search/

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GET #

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Text Content

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 1. Home
 2. Firefox
 3. Advanced and experimental features
 4. Canary domain

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CANARY DOMAIN - USE-APPLICATION-DNS.NET

To signal that their local DNS resolver implements special features that make
the network unsuitable for DNS-over-HTTPS (DoH), network administrators may
configure their networks to modify DNS requests for the following
special-purpose domain, called a canary domain: use-application-dns.net.

Note: 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.

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 negative if:

 * A response code other than NOERROR is returned, such as NXDOMAIN
   (non-existent domain) or SERVFAIL.
 * A NOERROR response code is returned, but contains neither A nor AAAA records.

The result will be considered positive if the query completes with NOERROR and
contains A or AAAA records (or both).

A negative result will be a signal to disable application DNS, (i.e., DoH).

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.

Note: 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.


Share this article: https://mzl.la/3Q9672V

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These fine people helped write this article:

AliceWyman, Mozinet, Joni, Angela Lazar


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هَوْسَ עברית हिन्दी (भारत) Hrvatski Magyar Dolnoserbšćina Hornjoserbsce Bahasa
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Malagasy Македонски മലയാളം Bahasa Melayu नेपाली Nederlands Norsk Polski
Português (do Brasil) Português (Europeu) română Русский සිංහල slovenčina
slovenščina Shqip Српски Kiswahili Svenska தமிழ் தமிழ் (இலங்கை) తెలుగు ไทย
Setswana Türkçe Українська اُردو Tiếng Việt Wolof isiXhosa èdè Yorùbá 中文 (简体)
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support.mozilla.org Open in urlscan Pro 34.149.128.2 Public Scan

Form analysis 7 forms found in the DOM

GET /en-US/search/

GET /en-US/search/

GET /en-US/search/

GET /en-US/search/

POST /en-US/kb/canary-domain-use-application-dnsnet/vote

POST /en-US/kb/canary-domain-use-application-dnsnet/vote

GET #

Text Content

support.mozilla.org Open in urlscan Pro
34.149.128.2 Public Scan

Form analysis
7 forms found in the DOM