URI schemes (IANA registry)

Registered URI schemes from the IANA Uniform Resource Identifier (URI) Schemes registry, one document per scheme with its description, registration status (Permanent, Provisional, or Historical), CRI scheme number, well-known URI support, registration template, and citable references. References that name individuals are omitted.

Browse 435 documents Use with your agent

Documents

Showing 1–24 of 435 documents

Document	Version
aaa (Diameter Protocol) The URI scheme "aaa" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Diameter Protocol".	v1
aaas (Diameter Protocol with Secure Transport) The URI scheme "aaas" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Diameter Protocol with Secure Transport".	v1
about The URI scheme "about" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
acap (application configuration access protocol) The URI scheme "acap" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "application configuration access protocol".	v1
acct The URI scheme "acct" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
acd The URI scheme "acd" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ace The URI scheme "ace" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
acr The URI scheme "acr" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
adiumxtra The URI scheme "adiumxtra" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
adt The URI scheme "adt" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
aet The URI scheme "aet" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
afp The URI scheme "afp" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
afs (Andrew File System global file names) The URI scheme "afs" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Andrew File System global file names".	v1
agtp The URI scheme "agtp" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
aim The URI scheme "aim" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
amss The URI scheme "amss" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
android The URI scheme "android" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
appdata The URI scheme "appdata" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
apt The URI scheme "apt" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ar The URI scheme "ar" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ari The URI scheme "ari" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ark The URI scheme "ark" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ars The URI scheme "ars" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
at (at (see [reviewer notes])) The URI scheme "at" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "at (see [reviewer notes])".	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 436
Documents: 435 documents
Reviewed: 2026-10-05
Last approved change: 2026-10-05
Agent lookups: 0 in the last 90 days
Reuse: IANA Uniform Resource Identifier (URI) Schemes registry (iana.org/assignments/uri-schemes); registry data reproduced verbatim with references
Review status: Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

Use this dataset from an agent

Agents can query it without an account. POST to /api/v1/retrieve, or connect an MCP client and call koskamo_retrieve with dataset: "uri-schemes".

Set up your agent Read documents as JSON

The JSON endpoint returns document text and source links in pages. Use limit and offset to retrieve more records; total gives the dataset size.

retrieve request

curl --fail-with-body 'https://koskamo.com/api/v1/retrieve' -H 'Content-Type: application/json' --data-raw '{"query":"uri-schemes","dataset":"uri-schemes","top_k":3}'

Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

Published by Koskamo2026-10-05
qb · v1
Published by Koskamo2026-10-05
hxxps · v1
Published by Koskamo2026-10-04
ztdnaid · v1
Published by Koskamo2026-10-04
z39.50s (Z39.50 Session) · v1
Published by Koskamo2026-10-04
z39.50r (Z39.50 Retrieval) · v1
Published by Koskamo2026-10-04
z39.50 (Z39.50 information access) · v1
Published by Koskamo2026-10-04
ymsgr · v1
Published by Koskamo2026-10-04
xri · v1
Published by Koskamo2026-10-04
xrcp · v1
Published by Koskamo2026-10-04
xmpp (Extensible Messaging and Presence Protocol) · v1