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 121–144 of 435 documents

Document	Version
h323 (H.323) The URI scheme "h323" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "H.323".	v1
ham The URI scheme "ham" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hcap The URI scheme "hcap" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hcp The URI scheme "hcp" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hs20 The URI scheme "hs20" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
http (Hypertext Transfer Protocol) The URI scheme "http" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Hypertext Transfer Protocol".	v1
https (Hypertext Transfer Protocol Secure) The URI scheme "https" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Hypertext Transfer Protocol Secure".	v1
hxxp The URI scheme "hxxp" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hxxps The URI scheme "hxxps" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hydrazone The URI scheme "hydrazone" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
hyper The URI scheme "hyper" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
i0 The URI scheme "i0" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
iax (Inter-Asterisk eXchange Version 2) The URI scheme "iax" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Inter-Asterisk eXchange Version 2".	v1
ibi The URI scheme "ibi" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ibi- The URI scheme "ibi-" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
icap (Internet Content Adaptation Protocol) The URI scheme "icap" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Internet Content Adaptation Protocol".	v1
icon The URI scheme "icon" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ilstring The URI scheme "ilstring" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
im (Instant Messaging) The URI scheme "im" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Instant Messaging".	v1
imap (internet message access protocol) The URI scheme "imap" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "internet message access protocol".	v1
info The URI scheme "info" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Information Assets with Identifiers in…	v1
interaction The URI scheme "interaction" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
iotdisco The URI scheme "iotdisco" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.	v1
ipfs The URI scheme "ipfs" 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