Topzle Updated: Wikipedia source
A well-known URI is a Uniform Resource Identifier for URL path prefixes that start with /.well-known/. They are implemented in webservers so that requests to the servers for well-known services or information are available at URLs consistent well-known locations across servers.
| URI suffix | Description | Reference | Date of IANA registration |
| acme-challenge | Automated Certificate Management Environment (ACME) | 2019-03-01 | |
| agent-card.json | Details for an A2A Server's Agent Card | ||
| ai-plugin.json | Manifest for a ChatGPT plugin | ||
| apple-app-site-association | An Apple service that enables secure data exchange between iOS and a website | ||
| apple-developer-merchantid-domain-association | Apple Pay | ||
| appspecific | Used by some application to get some informations about the application (e.g chrome devtools: appspecific/com.chrome.devtools.json) | ||
| ashrae | BACnet – A data communication protocol for building automation and control networks | 2016-01-22 | |
| assetlinks.json | AssetLinks protocol used to identify one or more digital assets (such as web sites or mobile apps) that are related to the hosting web site in some fashion | 2015-09-28 | |
| atproto-did | Handle-to-DID resolution for AT Protocol | ||
| autoconfig/mail | Mozilla Thunderbird mail autoconfiguration service | ||
| browserid | Mozilla Persona | ||
| caldav | Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV) | ||
| carddav | Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV) | ||
| change-password | Helps password managers find the URL for changing client account passwords | ||
| coap | CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets | 2017-12-22 | |
| com.apple.remotemanagement | Apple-Account–based user enrollment for mobile device management | ||
| com.chrome.devtools.json | Automatic Workspace Folders - Chromium DevTools Ecosystem Guide for Web_development_tools | ||
| core | Constrained RESTful Environments (CoRE) Link Format | ||
| csvm | CSV metadata, Model for Tabular Data and Metadata on the Web | 2015-09-28 | |
| dat | Links domain to Dat identifier, used by Beaker web browser | ||
| did.json | did:web Decentralized Identifiers (DIDs) for the Web | ||
| discord | Domain verification for Discord account connection | ||
| dnt | Site-wide tracking status resource | 2015-08-19 | |
| dnt-policy.txt | A privacy-friendly Do Not Track (DNT) Policy | 2015-08-19 | |
| est | Enrollment over Secure Transport (EST) | 2013-08-16 | |
| genid | Resource Description Framework (RDF) Skolem IRIs | 2012-11-15 | |
| gpc.json | Global Privacy Control (GPC) | ||
| hoba | HTTP Origin-Bound Authentication (HOBA) | 2015-01-20 | |
| host-meta | Web Host Metadata | ||
| host-meta.json | Web Host Metadata | ||
| http-opportunistic | Opportunistic Security for HTTP/2 | 2017-03-20 | |
| keybase.txt | Used by the Keybase project to identify a proof that one or more people whose public keys may be retrieved using the Keybase service have administrative control over the origin server from which it is retrieved | 2014-04-08 | |
| keyparc | Used by the Bloombase Keyparc project to secure online digital assets using cryptography over web services | 2012-09-23 | |
| matrix | Provides discovery for both client and server APIs to the Matrix federated protocol | ||
| mercure | Discovery of Mercure hubs. Mercure is a protocol enabling the pushing of data updates to web browsers and other HTTP clients in a fast, reliable and battery-efficient way. | ||
| mta-sts.txt | SMTP MTA Strict Transport Security Policy | 2018-06-21 | |
| ni | Naming Things with Hashes | ||
| nodeinfo | for federated social networking servers | ||
| nostr.json | Discovery of Nostr public keys and related relays, according to NIP-05 | 2024-03-18 | |
| oauth-authorization-server | OAuth Authorization Server Metadata | 2018-03-27 | |
| openid-configuration | OpenID Connect | 2013-08-27 | |
| openorg | Organisation Profile Document | 2015-05-29 | |
| openpgpkey | OpenPGP Web Key Service | ||
| org.flathub.VerifiedApps.txt | Verifies that an app is associated with given domain in Flathub | ||
| passkey-endpoints | Formally advertises support for passkeys and provides direct links for enrollment and management for password managers to automatically create/upgrade. | ||
| pki-validation | CA/Browser Forum’s Baseline Requirements Certificate Policy for the Issuance and Management of Publicly-Trusted Certificates | 2017-02-06 | |
| posh | PKIX over Secure HTTP (POSH) | 2015-09-20 | |
| privacy-sandbox-attestations.json | The Google Chrome Privacy Sandbox attestation file | ||
| pubvendors.json | The IAB pubvendors.json tech spec, which provide a standard for publishers to publicly declare the vendors that they work with, and their respective data rights/configuration | 2020-09-07 |