| URI Suffix Reference Status Change Controller Related Information Date Registered Date Modified |
| acme-challenge [RFC8555, Section 8.3] permanent IETF 2016-08-18 |
| agent-card.json [https://a2aproject.github.io/A2A/latest/specification/] permanent Linux Foundation 2025-08-01 |
| amphtml [https://developers.google.com/amp/cache/update-cache] provisional AMP Project (OpenJS Foundation) 2020-07-06 |
| api-catalog [RFC9727] permanent IETF 2024-12-23 |
| appspecific [https://github.com/Vroo/well-known-uri-appspecific/blob/main/well-known-uri-for-application-specific-purposes.txt] provisional [Bruce_Leban] 2021-06-01 |
| ashrae [http://www.bacnet.org/Addenda/Add-135-2012am-ppr3-draft-17_chair_approved.pdf] permanent [ASHRAE] 2016-01-22 |
| assetlinks.json [https://github.com/google/digitalassetlinks/blob/master/well-known/specification.md] permanent [Google_Inc.] [https://github.com/google/digitalassetlinks/blob/master/well-known/details.md] 2015-09-28 |
| broadband-labels [https://www.bitag.org/BITAG-BB-Labels.pdf] provisional [BITAG] 2024-08-30 |
| brski [RFC8995] permanent IETF BRSKI has a registry at [https://www.iana.org/assignments/brski-parameters/brski-parameters.xhtml#brski-well-known-uris] 2020-10-09 |
| caldav [RFC6764] permanent IETF see also [RFC4791] |
| carddav [RFC6764] permanent IETF see also [RFC6352] |
| change-password [https://w3c.github.io/webappsec-change-password-url/#the-change-password-well-known-uri] provisional W3C 2023-03-13 |
| cmp [RFC9811][RFC9482] permanent IETF CMP has a registry at [https://www.iana.org/assignments/cmp] 2021-05-20 2025-01-14 |
| coap [RFC8323] permanent IETF 2017-12-22 |
| coap-eap [RFC9820] permanent IETF 2025-02-14 |
| core [RFC6690] permanent IETF |
| csaf [Common Security Advisory Framework Version 2.0, OASIS Standard] provisional [OASIS_Open] 2023-02-10 |
| csaf-aggregator [Common Security Advisory Framework Version 2.0, OASIS Standard] provisional [OASIS_Open] 2023-02-10 |
| csvm [https://www.w3.org/TR/tabular-data-model/#default-locations-and-site-wide-location-configuration] permanent W3C 2015-09-28 |
| did.json [https://w3c-ccg.github.io/did-method-web] provisional [Credentials_Community_Group] 2023-01-31 |
| did-configuration.json [https://identity.foundation/.well-known/resources/did-configuration] provisional [Claims_and_Credentials_WG] 2023-01-31 |
| dnt [http://www.w3.org/TR/tracking-dnt/#status-resource] permanent [W3C_Tracking_Protection_WG] 2015-08-19 |
| dnt-policy.txt [https://www.eff.org/dnt-policy] permanent Electronic Frontier Foundation 2015-08-19 |
| dots [RFC9132] permanent IETF 2020-01-16 2021-06-11 |
| easy-proxy [https://github.com/bytedance/g3/blob/master/doc/easy-proxy.md] provisional [The_G3_Project] 2025-05-01 |
| ecips [https://ecips.that.world/24-ECIPURI] provisional [Wei_Tang] 2019-04-10 |
| edhoc [RFC9528] permanent IETF 2023-08-29 |
| enterprise-network-security [ETSI TS 103 523-5 clause 4.3.4.3.4.2] permanent [ETSI_TC_CYBER] 2022-02-07 |
| enterprise-transport-security [ETSI TS 103 523-3 clause 4.3.8.3] permanent [ETSI_TC_CYBER] 2019-05-14 |
| est [RFC7030][RFC9148] permanent IETF 2013-08-16 2020-04-29 |
| funding-manifest-urls [https://fundingjson.org/] provisional [info_at_floss.fund] 2025-04-02 |
| genid [RDF 1.1 Concepts and Abstract Syntax] permanent W3C 2012-11-15 |
| gnap-as-rs [RFC9767, Section 3.1] permanent IETF 2024-10-23 |
| gpc.json [https://globalprivacycontrol.github.io/gpc-spec/] provisional [Global_Privacy_Control_project] 2022-01-28 |
| gs1resolver [GS1 Digital Link, Section 7.11] permanent [GS1] 2020-05-18 |
| hoba [RFC7486, Section 6] permanent IETF 2015-01-20 |
| host-meta [RFC6415] permanent IETF The "host-meta" documents obtained from the same host using the HTTP and HTTPS protocols (using default ports) MUST be identical. |
| host-meta.json [RFC6415] permanent IETF The "host-meta.json" documents obtained from the same host using the HTTP and HTTPS protocols (using default ports) MUST be identical. |
| hosting-provider [https://github.com/Automattic/hosting-provider] provisional [Automattic_Inc.] 2020-07-21 |
| http-opportunistic [RFC8164, Section 2.3][Status change of HTTP experiments to Historic] obsoleted IETF 2017-03-20 2021-12-28 |
| idp-proxy [RFC8827] permanent IETF 2019-07-25 |
| jmap [RFC8620, Section 2.2] permanent IETF 2019-03-28 |
| keybase.txt [https://keybase.io/__/keybase_well_known] permanent [The_Keybase_Project] Related information: Documentation for the Keybase [command line] and [API]. 2014-04-08 |
| knx [https://knxcloud.org/index.php/s/jdZXpCC3EolQgH2/download] provisional [KNX_Association] 2023-08-15 |
| looking-glass [RFC8522, Section 2] permanent [M._Stubbig] 2018-12-07 |
| masque [RFC9298][RFC9484] permanent IETF For sub-suffix allocations, see the registry at [https://www.iana.org/assignments/masque]. 2022-06-23 2023-05-16 |
| matrix [https://spec.matrix.org/latest/client-server-api/#well-known-uri][https://spec.matrix.org/latest/server-server-api/#getwell-knownmatrixserver] permanent [The_Matrix.org_Foundation_C.I.C.] 2019-04-16 2023-06-20 |
| mercure [https://mercure.rocks/spec] provisional [Les-Tilleuls.coop] 2023-03-20 |
| mta-sts.txt [RFC8461] permanent IETF 2018-06-21 |
| mud obsoleted 2016-11-23 2021-12-28 |
| nfv-oauth-server-configuration [ETSI GS NFV-SEC 022 V2.7.1] permanent [ETSI] 2019-06-26 2020-01-22 |
| ni [RFC6920] permanent IETF |
| nodeinfo [https://nodeinfo.diaspora.software/] provisional [NodeInfo_Developer_Community] 2024-07-29 |
| nostr.json [https://github.com/nostr-protocol/nips/blob/master/05.md] provisional [Nostr_Developer_Community] 2024-03-18 |
| oauth-authorization-server [RFC8414, Section 3] permanent IESG 2018-03-27 |
| oauth-protected-resource [RFC9728, Section 3] permanent IETF 2024-10-22 |
| ohttp-gateway [RFC9540] permanent IETF 2023-10-25 |
| openid-federation [Section 9 of OpenID Federation 1.0] provisional [OpenID_Foundation_Artifact_Binding_Working_Group] 2024-07-26 |
| open-resource-discovery [https://sap.github.io/open-resource-discovery/] provisional [SAP_SE] 2023-11-27 |
| openid-configuration [http://openid.net/specs/openid-connect-discovery-1_0.html] permanent [OpenID_Foundation_Artifact_Binding_Working_Group] 2013-08-27 |
| openorg [http://opd.data.ac.uk/] permanent [cjg_at_ecs.soton.ac.uk] 2015-05-29 |
| oslc [https://docs.oasis-open-projects.org/oslc-op/core/v3.0/ps01/oslc-core.html] permanent [OASIS] 2020-12-29 |
| pki-validation [Section 3.2.2.4.6 of version 1.3.8 of the CA/Browser Forum’s Baseline Requirements Certificate Policy for the Issuance and Management of Publicly-Trusted Certificates (“Baseline Requirements”)] permanent [CA_Browser_Forum] See also [https://cabforum.org/baseline-requirements-documents/] 2017-02-06 |
| posh [RFC7711] permanent IETF The suffix "posh" is expected to be followed by an additional path component consisting of a service name (say, "spice") and a file extension of ".json", resulting in a full path of, for instance, "/.well-known/posh/spice.json". Registration of service names shall be requested by developers of the relevant application protocols. 2015-09-20 |
| privacy-sandbox-attestations.json [https://github.com/privacysandbox/attestation] provisional [Google_Inc.] 2024-12-04 |
| private-token-issuer-directory [RFC9578] permanent IETF 2023-10-09 |
| probing.txt [RFC9511] permanent IETF 2023-09-01 |
| pvd [RFC8801] permanent IETF 2020-02-18 |
| rd [RFC9176] permanent IETF 2021-05-04 |
| related-website-set.json [https://github.com/GoogleChrome/related-website-sets/blob/main/Well-Known-Specification.md] provisional [Google_Inc.] 2023-12-01 |
| reload-config [RFC6940] permanent IETF |
| repute-template [RFC7072] permanent IETF 2013-09-30 |
| resourcesync [http://www.openarchives.org/rs/resourcesync] permanent [NISO] 2017-05-26 |
| sbom [RFC9472] permanent IETF See ISO/IEC 5962:2021 and SPDX.org 2023-05-12 |
| security.txt [RFC9116] permanent IETF 2021-07-13 |
| ssf-configuration [https://openid.net/specs/openid-sharedsignals-framework-1_0-ID2.html] provisional [OpenID_Shared_Signals_Working_Group] 2024-04-18 |
| sshfp [https://sshfp.github.io/sshfp.html] provisional [Cynthia_Revström] 2020-07-21 |
| stun-key [RFC7635] permanent IETF 2015-06-12 |
| terraform.json [https://developer.hashicorp.com/terraform/internals/remote-service-discovery] provisional [HashiCorp_Terraform_Team] 2024-07-01 |
| thread [https://www.threadgroup.org/support#specifications] permanent [Thread_Group_Inc.] 2018-11-29 |
| time [http://phk.freebsd.dk/time/20151129/] permanent [Poul-Henning_Kamp] 2015-12-09 |
| timezone [RFC7808] permanent IESG 2015-08-03 |
| tdmrep.json [https://www.w3.org/2022/tdmrep/] provisional W3C 2024-02-15 |
| tor-relay [The "tor-relay" Well-Known Resource Identifier] provisional [Tor_Project_Development_Mailing_List] 2020-10-06 |
| tpcd [The "tpcd/grace-period.json" Well-Known Resource Identifier] provisional [Google_LLC] [https://github.com/explainers-by-googlers/3pcd-grace-period-opt-out] 2024-05-08 |
| traffic-advice [https://buettner.github.io/private-prefetch-proxy/traffic-advice.html] provisional [Jeremy_Roman] 2022-03-29 |
| trust.txt [https://journallist.net/reference-document-for-trust-txt-specifications] provisional JournalList.net 2022-02-04 |
| uma2-configuration [UMA 2.0 Grant for OAuth 2.0, Section 2] permanent [Kantara_UMA_WG] 2017-06-20 |
| void [http://www.w3.org/TR/void] permanent W3C 2011-05-11 |
| webfinger [RFC7033] permanent IETF The query to the WebFinger resource will include one or more parameters in the query string; see Section 4.1 of [RFC7033]. Resources at this location are able to return a JSON Resource Descriptor (JRD) as described in Section 4.4 of [RFC7033]. 2013-03-15 2013-09-06 |
| webhook-authorized-senders.json [https://intempus.dk/webhook-authorization] permanent [Intempus_ApS] 2025-09-29 |
| webweaver.json [https://www.webweaver.de/well-known] provisional [DigiOnline_GmbH] 2022-08-11 |
| wot [https://www.w3.org/TR/wot-discovery/#introduction-well-known] permanent [W3C_WoT_WG] 2023-01-24 |