Well-known ports (IANA registry)

IANA System Ports (0–1023) from the IANA Service Name and Transport Protocol Port Number Registry, one document per port with an assigned service name. Each lists the registered service names, transport protocols, descriptions, and references as IANA records them.

Browse 686 documents Use with your agent

Documents

Showing 409–432 of 686 documents

Document	Version
Port 546 (dhcpv6-client) Port 546 is an IANA System Port assigned to dhcpv6-client (DHCPv6 Client) over TCP and UDP.	v1
Port 547 (dhcpv6-server) Port 547 is an IANA System Port assigned to dhcpv6-server (DHCPv6 Server) over TCP and UDP.	v1
Port 548 (afpovertcp) Port 548 is an IANA System Port assigned to afpovertcp (AFP over TCP) over TCP and UDP.	v1
Port 549 (idfp) Port 549 is an IANA System Port assigned to idfp (IDFP) over TCP and UDP.	v1
Port 55 (isi-gl) Port 55 is an IANA System Port assigned to isi-gl (ISI Graphics Language) over TCP and UDP.	v1
Port 550 (new-rwho) Port 550 is an IANA System Port assigned to new-rwho (new-who) over TCP and UDP.	v1
Port 551 (cybercash) Port 551 is an IANA System Port assigned to cybercash (cybercash) over TCP and UDP.	v1
Port 552 (devshr-nts) Port 552 is an IANA System Port assigned to devshr-nts (DeviceShare) over TCP and UDP.	v1
Port 553 (pirp) Port 553 is an IANA System Port assigned to pirp (pirp) over TCP and UDP.	v1
Port 554 (rtsp) Port 554 is an IANA System Port assigned to rtsp (Real Time Streaming Protocol (RTSP)) over TCP and UDP.	v1
Port 555 (dsf) Port 555 is an IANA System Port assigned to dsf over TCP and UDP.	v1
Port 556 (remotefs) Port 556 is an IANA System Port assigned to remotefs (rfs server) over TCP and UDP.	v1
Port 557 (openvms-sysipc) Port 557 is an IANA System Port assigned to openvms-sysipc (openvms-sysipc) over TCP and UDP.	v1
Port 558 (sdnskmp) Port 558 is an IANA System Port assigned to sdnskmp (SDNSKMP) over TCP and UDP.	v1
Port 559 (teedtap) Port 559 is an IANA System Port assigned to teedtap (TEEDTAP) over TCP and UDP.	v1
Port 56 (xns-auth) Port 56 is an IANA System Port assigned to xns-auth (XNS Authentication) over TCP and UDP.	v1
Port 560 (rmonitor) Port 560 is an IANA System Port assigned to rmonitor (rmonitord) over TCP and UDP.	v1
Port 561 (monitor) Port 561 is an IANA System Port assigned to monitor over TCP and UDP.	v1
Port 562 (chshell) Port 562 is an IANA System Port assigned to chshell (chcmd) over TCP and UDP.	v1
Port 563 (nntps) Port 563 is an IANA System Port assigned to nntps (nntp protocol over TLS/SSL (was snntp)) over TCP and UDP.	v1
Port 564 (9pfs) Port 564 is an IANA System Port assigned to 9pfs (plan 9 file service) over TCP and UDP.	v1
Port 565 (whoami) Port 565 is an IANA System Port assigned to whoami (whoami) over TCP and UDP.	v1
Port 566 (streettalk) Port 566 is an IANA System Port assigned to streettalk (streettalk) over TCP and UDP.	v1
Port 567 (banyan-rpc) Port 567 is an IANA System Port assigned to banyan-rpc (banyan-rpc) over TCP and UDP.	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 687
Documents: 686 documents
Reviewed: 2026-10-04
Last approved change: 2026-10-04
Agent lookups: 2 in the last 90 days
Reuse: IANA Service Name and Transport Protocol Port Number Registry (iana.org/assignments/service-names-port-numbers), system ports 0-1023; 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: "well-known-ports".

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":"well-known-ports","dataset":"well-known-ports","top_k":3}'

Change history

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

Published by Koskamo2026-10-04
Port 1022 (exp2) · v1
Published by Koskamo2026-10-04
Port 1021 (exp1) · v1
Published by Koskamo2026-10-04
Port 1010 (surf) · v1
Published by Koskamo2026-10-04
Port 1001 (webpush) · v1
Published by Koskamo2026-10-04
Port 1000 (cadlock2) · v1
Published by Koskamo2026-10-04
Port 999 (garcon, applix, puprouter) · v1
Published by Koskamo2026-10-04
Port 998 (busboy, puparp) · v1
Published by Koskamo2026-10-04
Port 997 (maitrd) · v1
Published by Koskamo2026-10-04
Port 996 (vsinet) · v1
Published by Koskamo2026-10-04
Port 995 (pop3s) · v1