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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 documentsUse with your agent

Documents

Showing 289–312 of 435 documents

DocumentVersion

onenote-cmd

The URI scheme "onenote-cmd" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

opaquelocktoken (opaquelocktokent)

The URI scheme "opaquelocktoken" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "opaquelocktokent".

v1

openid (OpenID Connect)

The URI scheme "openid" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "OpenID Connect".

v1

openpgp4fpr

The URI scheme "openpgp4fpr" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

otpauth

The URI scheme "otpauth" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

p1

The URI scheme "p1" is a Historical registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

pack

The URI scheme "pack" is a Historical registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

palm

The URI scheme "palm" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

paparazzi

The URI scheme "paparazzi" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

payment

The URI scheme "payment" is a Historical registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

payto

The URI scheme "payto" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

pkcs11 (PKCS#11)

The URI scheme "pkcs11" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "PKCS#11".

v1

pkg

The URI scheme "pkg" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

platform

The URI scheme "platform" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

pop (Post Office Protocol v3)

The URI scheme "pop" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Post Office Protocol v3".

v1

pres (Presence)

The URI scheme "pres" is a Permanent registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Presence".

v1

prospero (Prospero Directory Service)

The URI scheme "prospero" is a Historical registration in the IANA Uniform Resource Identifier (URI) Schemes registry. It is described as "Prospero Directory Service".

v1

proxy

The URI scheme "proxy" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

psyc

The URI scheme "psyc" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

pttp

The URI scheme "pttp" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

pwid

The URI scheme "pwid" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

qb

The URI scheme "qb" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

query

The URI scheme "query" is a Provisional registration in the IANA Uniform Resource Identifier (URI) Schemes registry.

v1

quic-transport

The URI scheme "quic-transport" 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 agentRead 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.

  1. Published by Koskamo

    qb · v1

  2. Published by Koskamo

    hxxps · v1

  3. Published by Koskamo

    ztdnaid · v1

  4. Published by Koskamo

    z39.50s (Z39.50 Session) · v1

  5. Published by Koskamo

    z39.50r (Z39.50 Retrieval) · v1

  6. Published by Koskamo

    z39.50 (Z39.50 information access) · v1

  7. Published by Koskamo

    ymsgr · v1

  8. Published by Koskamo

    xri · v1

  9. Published by Koskamo

    xrcp · v1

  10. Published by Koskamo

    xmpp (Extensible Messaging and Presence Protocol) · v1