| acme-challenge |
RFC 8555, Section 8.3 |
permanent |
IETF |
|
2016-08-18 |
|
| agent-card.json |
https://a2a-protocol.org/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 |
RFC 9727 |
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 |
American Society of Heating, Refrigeration, and Air-conditioning Engineers (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 |
|
| bluejetty |
https://bluejettyai.com/standards/iana-well-known/bluejetty |
provisional |
PopUp Space Systems LLC (Blue Jetty) |
|
2026-09-16 |
|
| broadband-labels |
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5681704 |
provisional |
Broadband Internet Technical Advisory Group (BITAG) |
|
2024-08-30 |
2026-02-25 |
| brski |
RFC 8995 |
permanent |
IETF |
BRSKI has a registry at BRSKI Well-Known URIs |
2020-10-09 |
|
| caldav |
RFC 6764 |
permanent |
IETF |
see also RFC 4791 |
|
|
| carddav |
RFC 6764 |
permanent |
IETF |
see also RFC 6352 |
|
|
| cdmi |
https://www.snia.org/sites/default/files/technical-work/cdmi/Public_Review/well_known_0.0.1.pdf |
provisional |
Storage Networking Industry Association (SNIA) |
|
2026-10-07 |
|
| change-password |
https://w3c.github.io/webappsec-change-password-url/#the-change-password-well-known-uri |
provisional |
W3C |
|
2023-03-13 |
|
| cmp |
RFC 9811; RFC 9482 |
permanent |
IETF |
CMP has a registry at Certificate Management Protocol (CMP) |
2021-05-20 |
2025-01-14 |
| coap |
RFC 8323 |
permanent |
IETF |
|
2017-12-22 |
|
| coap-eap |
RFC 9820 |
permanent |
IETF |
|
2025-02-14 |
|
| core |
RFC 6690 |
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 |
|
| csipaus |
SA TS 5573:2025 Common Smart Inverter Profile - Australia with Test Procedures |
provisional |
Common Smart Inverter Profile - Australia Secretariat |
|
2026-07-31 |
|
| csvm |
https://www.w3.org/TR/tabular-data-model/#default-locations-and-site-wide-location-configuration |
permanent |
W3C |
|
2015-09-28 |
|
| cyclic-trigger |
https://github.com/SmartStandards/.well-known.cyclic-trigger |
provisional |
SmartStandards Community |
|
2026-08-17 |
|
| 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 |
RFC 9132 |
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 |
RFC 9528 |
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 |
RFC 7030; RFC 9148 |
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 |
RFC 9767, Section 3.1 |
permanent |
IETF |
|
2024-10-23 |
|
| gpc.json |
Global Privacy Control (GPC) |
provisional |
W3C |
|
2022-01-28 |
|
| gs1resolver |
GS1 Digital Link, Section 7.11 |
permanent |
GS1 |
|
2020-05-18 |
|
| hoba |
RFC 7486, Section 6 |
permanent |
IETF |
|
2015-01-20 |
|
| host-meta |
RFC 6415 |
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 |
RFC 6415 |
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 |
RFC 8164, Section 2.3; Status change of HTTP experiments to Historic |
obsoleted |
IETF |
|
2017-03-20 |
2021-12-28 |
| ic-domains |
https://docs.internetcomputer.org/building-apps/frontends/custom-domains/using-custom-domains#step-2-create-a-file-named-ic-domains-in-your-canister-under-the-well-known-directory-containing-the-custom-domain |
provisional |
DFINITY Foundation |
|
2026-01-12 |
|
| idp-proxy |
RFC 8827 |
permanent |
IETF |
|
2019-07-25 |
|
| jmap |
RFC 8620, 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 |
RFC 8522, Section 2 |
permanent |
Markus Stubbig |
|
2018-12-07 |
|
| masque |
RFC 9298; RFC 9484 |
permanent |
IETF |
For sub-suffix allocations, see the registry at Multiplexed Application Substrate over QUIC Encryption (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 |
RFC 8461 |
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 |
RFC 6920 |
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 |
RFC 8414, Section 3 |
permanent |
IESG |
|
2018-03-27 |
|
| oauth-protected-resource |
RFC 9728, Section 3 |
permanent |
IETF |
|
2024-10-22 |
|
| ohttp-gateway |
RFC 9540 |
permanent |
IETF |
|
2023-10-25 |
|
| ojobpub.json |
https://docs.letsemploy.org |
provisional |
letsemploy.org |
|
2026-05-12 |
|
| openbindings |
https://openbindings.com/spec |
provisional |
OpenBindings Project |
|
2026-05-13 |
|
| 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 |
Christopher Gutteridge |
|
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 |
RFC 7711 |
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 |
deprecated |
Google Inc. |
|
2024-12-04 |
2026-04-01 |
| private-token-issuer-directory |
RFC 9578 |
permanent |
IETF |
|
2023-10-09 |
|
| probing.txt |
RFC 9511 |
permanent |
IETF |
|
2023-09-01 |
|
| pvd |
RFC 8801 |
permanent |
IETF |
|
2020-02-18 |
|
| rd |
RFC 9176 |
permanent |
IETF |
|
2021-05-04 |
|
| related-website-set.json |
https://github.com/GoogleChrome/related-website-sets/blob/main/Well-Known-Specification.md |
deprecated |
Google Inc. |
|
2023-12-01 |
2026-04-01 |
| reload-config |
RFC 6940 |
permanent |
IETF |
|
|
|
| repute-template |
RFC 7072 |
permanent |
IETF |
|
2013-09-30 |
|
| resourcesync |
http://www.openarchives.org/rs/resourcesync |
permanent |
National Information Standardization Organization (NISO) |
|
2017-05-26 |
|
| sbom |
RFC 9472 |
permanent |
IETF |
See ISO/IEC 5962:2021 and SPDX.org |
2023-05-12 |
|
| scitt-keys |
RFC-ietf-scitt-scrapi-11 |
permanent |
IETF |
RFC 9943 |
2026-07-01 |
|
| security.txt |
RFC 9116 |
permanent |
IETF |
|
2021-07-13 |
|
| ssf-configuration |
https://openid.net/specs/openid-sharedsignals-framework-1_0-ID2.html |
provisional |
OpenID Foundation Shared Signals Working Group |
|
2024-04-18 |
|
| ssh-known-hosts |
https://c2sp.org/well-known-ssh-hosts |
provisional |
David Crawshaw |
|
2025-12-16 |
|
| sshfp |
https://sshfp.github.io/sshfp.html |
provisional |
Cynthia Revström |
|
2020-07-21 |
|
| stun-key |
RFC 7635 |
permanent |
IETF |
|
2015-06-12 |
|
| tea |
Transparency Exchange API (coming) |
provisional |
ECMA International TC54 |
|
2026-02-28 |
|
| 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 |
RFC 7808 |
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 |
deprecated |
Google LLC |
https://github.com/explainers-by-googlers/3pcd-grace-period-opt-out |
2024-05-08 |
2026-04-01 |
| 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 Initiative User-Managed Access Work Group |
|
2017-06-20 |
|
| vacation-rental.json |
https://vacationrentalprotocol.com/spec/well-known-uri-v0.1 |
provisional |
Rouiada Abbas |
|
2026-08-19 |
|
| void |
http://www.w3.org/TR/void |
permanent |
W3C |
|
2011-05-11 |
|
| webauthn |
https://www.w3.org/TR/webauthn-3/#well-known-uri-registration |
permanent |
W3C |
|
2026-01-23 |
|
| webfinger |
RFC 7033 |
permanent |
IETF |
The query to the WebFinger resource will
include one or more parameters in the query string; see Section 4.1 of RFC 7033. Resources at this location are able to return a JSON
Resource Descriptor (JRD) as described in Section 4.4 of RFC 7033. |
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 |
|
| xregistry |
https://xregistry.io/xreg/xregistryspecs/core-v1/docs/spec.html |
provisional |
xRegistry Authors |
|
2026-08-19 |
|
