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 25–48 of 435 documents

Document	Version
attachment The URI scheme "attachment" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
aw The URI scheme "aw" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
barion The URI scheme "barion" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bb The URI scheme "bb" is a Historical registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
beshare The URI scheme "beshare" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bitcoin The URI scheme "bitcoin" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bitcoincash The URI scheme "bitcoincash" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bl (bluetooth (shortened)) The URI scheme "bl" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "bluetooth (shortened)".	v1
blob The URI scheme "blob" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bluetooth The URI scheme "bluetooth" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
bolo The URI scheme "bolo" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
brid The URI scheme "brid" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
browserext The URI scheme "browserext" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
cabal The URI scheme "cabal" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
caip The URI scheme "caip" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
calculator The URI scheme "calculator" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
callto The URI scheme "callto" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
cap (Calendar Access Protocol) The URI scheme "cap" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Calendar Access Protocol".	v1
cast The URI scheme "cast" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
casts The URI scheme "casts" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
chrome The URI scheme "chrome" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
chrome-extension The URI scheme "chrome-extension" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
cid (content identifier) The URI scheme "cid" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "content identifier".	v1
cm The URI scheme "cm" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	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