Well-Known URIs
Well-Known URIs
Created<br>2010-01-20<br>Last Updated<br>2026-07-31<br>Available Formats
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Registry Included Below
Well-Known URIs
Well-Known URIs
Registration Procedure(s)
Specification Required
Expert(s)
Mark Nottingham
Reference<br>[RFC8615]<br>Note
New well-known URI registrations, along with changes to existing registrations, can be requested<br>using the [registry interface] or the mailing list defined in [RFC8615].
Available Formats
CSV
URI Suffix<br>Reference<br>Status<br>Change Controller<br>Related Information<br>Date Registered<br>Date Modified
acme-challenge<br>[RFC8555, Section 8.3]<br>permanent<br>IETF
2016-08-18
agent-card.json<br>[https://a2a-protocol.org/latest/specification/]<br>permanent<br>Linux Foundation
2025-08-01
amphtml<br>[https://developers.google.com/amp/cache/update-cache]<br>provisional<br>AMP Project (OpenJS Foundation)
2020-07-06
api-catalog<br>[RFC9727]<br>permanent<br>IETF
2024-12-23
appspecific<br>[https://github.com/Vroo/well-known-uri-appspecific/blob/main/well-known-uri-for-application-specific-purposes.txt]<br>provisional<br>[Bruce_Leban]
2021-06-01
ashrae<br>[http://www.bacnet.org/Addenda/Add-135-2012am-ppr3-draft-17_chair_approved.pdf]<br>permanent<br>[ASHRAE]
2016-01-22
assetlinks.json<br>[https://github.com/google/digitalassetlinks/blob/master/well-known/specification.md]<br>permanent<br>[Google_Inc.]<br>[https://github.com/google/digitalassetlinks/blob/master/well-known/details.md]<br>2015-09-28
broadband-labels<br>[https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5681704]<br>provisional<br>[BITAG]
2024-08-30<br>2026-02-25
brski<br>[RFC8995]<br>permanent<br>IETF<br>BRSKI has a registry at [https://www.iana.org/assignments/brski-parameters/brski-parameters.xhtml#brski-well-known-uris]
2020-10-09
caldav<br>[RFC6764]<br>permanent<br>IETF<br>see also [RFC4791]
carddav<br>[RFC6764]<br>permanent<br>IETF<br>see also [RFC6352]
change-password<br>[https://w3c.github.io/webappsec-change-password-url/#the-change-password-well-known-uri]<br>provisional<br>W3C
2023-03-13
cmp<br>[RFC9811][RFC9482]<br>permanent<br>IETF<br>CMP has a registry at [https://www.iana.org/assignments/cmp]
2021-05-20<br>2025-01-14
coap<br>[RFC8323]<br>permanent<br>IETF
2017-12-22
coap-eap<br>[RFC9820]<br>permanent<br>IETF
2025-02-14
core<br>[RFC6690]<br>permanent<br>IETF
csaf<br>[Common Security Advisory Framework Version 2.0, OASIS Standard]<br>provisional<br>[OASIS_Open]
2023-02-10
csaf-aggregator<br>[Common Security Advisory Framework Version 2.0, OASIS Standard]<br>provisional<br>[OASIS_Open]
2023-02-10
csipaus<br>[SA TS 5573:2025 Common Smart Inverter Profile - Australia with Test Procedures]<br>provisional<br>[Common_Smart_Inverter_Profile_-_Australia_Secretariat]
2026-07-31
csvm<br>[https://www.w3.org/TR/tabular-data-model/#default-locations-and-site-wide-location-configuration]<br>permanent<br>W3C
2015-09-28
did.json<br>[https://w3c-ccg.github.io/did-method-web]<br>provisional<br>[Credentials_Community_Group]
2023-01-31
did-configuration.json<br>[https://identity.foundation/.well-known/resources/did-configuration]<br>provisional<br>[Claims_and_Credentials_WG]
2023-01-31
dnt<br>[http://www.w3.org/TR/tracking-dnt/#status-resource]<br>permanent<br>[W3C_Tracking_Protection_WG]
2015-08-19
dnt-policy.txt<br>[https://www.eff.org/dnt-policy]<br>permanent<br>Electronic Frontier Foundation
2015-08-19
dots<br>[RFC9132]<br>permanent<br>IETF
2020-01-16<br>2021-06-11
easy-proxy<br>[https://github.com/bytedance/g3/blob/master/doc/easy-proxy.md]<br>provisional<br>[The_G3_Project]
2025-05-01
ecips<br>[https://ecips.that.world/24-ECIPURI]<br>provisional<br>[Wei_Tang]
2019-04-10
edhoc<br>[RFC9528]<br>permanent<br>IETF
2023-08-29
enterprise-network-security<br>[ETSI TS 103 523-5 clause 4.3.4.3.4.2]<br>permanent<br>[ETSI_TC_CYBER]
2022-02-07
enterprise-transport-security<br>[ETSI TS 103 523-3 clause 4.3.8.3]<br>permanent<br>[ETSI_TC_CYBER]
2019-05-14
est<br>[RFC7030][RFC9148]<br>permanent<br>IETF
2013-08-16<br>2020-04-29
funding-manifest-urls<br>[https://fundingjson.org/]<br>provisional<br>[info_at_floss.fund]
2025-04-02
genid<br>[RDF 1.1 Concepts and Abstract Syntax]<br>permanent<br>W3C
2012-11-15
gnap-as-rs<br>[RFC9767, Section 3.1]<br>permanent<br>IETF
2024-10-23
gpc.json<br>[Global Privacy Control (GPC)]<br>provisional<br>W3C
2022-01-28
gs1resolver<br>[GS1 Digital Link, Section 7.11]<br>permanent<br>[GS1]
2020-05-18
hoba<br>[RFC7486, Section 6]<br>permanent<br>IETF
2015-01-20
host-meta<br>[RFC6415]<br>permanent<br>IETF<br>The "host-meta" documents obtained from the same host using the HTTP and<br>HTTPS protocols (using default ports) MUST be identical.
host-meta.json<br>[RFC6415]<br>permanent<br>IETF<br>The "host-meta.json" documents obtained from the same host using the HTTP and<br>HTTPS protocols (using default ports) MUST be identical.
hosting-provider<br>[https://github.com/Automattic/hosting-provider]<br>provisional<br>[Automattic_Inc.]
2020-07-21
http-opportunistic<br>[RFC8164, Section 2.3][Status change of HTTP experiments to...