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 385–408 of 686 documents

Document	Version
Port 524 (ncp) Port 524 is an IANA System Port assigned to ncp (NCP) over TCP and UDP.	v1
Port 525 (timed) Port 525 is an IANA System Port assigned to timed (timeserver) over TCP and UDP.	v1
Port 526 (tempo) Port 526 is an IANA System Port assigned to tempo (newdate) over TCP and UDP.	v1
Port 527 (stx) Port 527 is an IANA System Port assigned to stx (Stock IXChange) over TCP and UDP.	v1
Port 528 (custix) Port 528 is an IANA System Port assigned to custix (Customer IXChange) over TCP and UDP.	v1
Port 529 (irc-serv) Port 529 is an IANA System Port assigned to irc-serv (IRC-SERV) over TCP and UDP.	v1
Port 53 (domain) Port 53 is an IANA System Port assigned to domain (Domain Name Server) over TCP and UDP.	v1
Port 530 (courier) Port 530 is an IANA System Port assigned to courier (rpc) over TCP and UDP.	v1
Port 531 (conference) Port 531 is an IANA System Port assigned to conference (chat) over TCP and UDP.	v1
Port 532 (netnews) Port 532 is an IANA System Port assigned to netnews (readnews) over TCP and UDP.	v1
Port 533 (netwall) Port 533 is an IANA System Port assigned to netwall (for emergency broadcasts) over TCP and UDP.	v1
Port 534 (windream) Port 534 is an IANA System Port assigned to windream (windream Admin) over TCP and UDP.	v1
Port 535 (iiop) Port 535 is an IANA System Port assigned to iiop (iiop) over TCP and UDP.	v1
Port 536 (opalis-rdv) Port 536 is an IANA System Port assigned to opalis-rdv (opalis-rdv) over TCP and UDP.	v1
Port 537 (nmsp) Port 537 is an IANA System Port assigned to nmsp (Networked Media Streaming Protocol) over TCP and UDP.	v1
Port 538 (gdomap) Port 538 is an IANA System Port assigned to gdomap (gdomap) over TCP and UDP.	v1
Port 539 (apertus-ldp) Port 539 is an IANA System Port assigned to apertus-ldp (Apertus Technologies Load Determination) over TCP and UDP.	v1
Port 54 (xns-ch) Port 54 is an IANA System Port assigned to xns-ch (XNS Clearinghouse) over TCP and UDP.	v1
Port 540 (uucp) Port 540 is an IANA System Port assigned to uucp (uucpd) over TCP and UDP.	v1
Port 541 (uucp-rlogin) Port 541 is an IANA System Port assigned to uucp-rlogin (uucp-rlogin) over TCP and UDP.	v1
Port 542 (commerce) Port 542 is an IANA System Port assigned to commerce (commerce) over TCP and UDP.	v1
Port 543 (klogin) Port 543 is an IANA System Port assigned to klogin over TCP and UDP.	v1
Port 544 (kshell) Port 544 is an IANA System Port assigned to kshell (krcmd) over TCP and UDP.	v1
Port 545 (appleqtcsrvr) Port 545 is an IANA System Port assigned to appleqtcsrvr (appleqtcsrvr) 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