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 361–384 of 686 documents

Document	Version
Port 501 (stmf) Port 501 is an IANA System Port assigned to stmf (STMF) over TCP and UDP.	v1
Port 502 (mbap) Port 502 is an IANA System Port assigned to mbap (Modbus Application Protocol) over TCP and UDP.	v1
Port 503 (intrinsa) Port 503 is an IANA System Port assigned to intrinsa (Intrinsa) over TCP and UDP.	v1
Port 504 (citadel) Port 504 is an IANA System Port assigned to citadel (citadel) over TCP and UDP.	v1
Port 505 (mailbox-lm) Port 505 is an IANA System Port assigned to mailbox-lm (mailbox-lm) over TCP and UDP.	v1
Port 506 (ohimsrv) Port 506 is an IANA System Port assigned to ohimsrv (ohimsrv) over TCP and UDP.	v1
Port 507 (crs) Port 507 is an IANA System Port assigned to crs (crs) over TCP and UDP.	v1
Port 508 (xvttp) Port 508 is an IANA System Port assigned to xvttp (xvttp) over TCP and UDP.	v1
Port 509 (snare) Port 509 is an IANA System Port assigned to snare (snare) over TCP and UDP.	v1
Port 510 (fcp) Port 510 is an IANA System Port assigned to fcp (FirstClass Protocol) over TCP and UDP.	v1
Port 511 (passgo) Port 511 is an IANA System Port assigned to passgo (PassGo) over TCP and UDP.	v1
Port 512 (exec, comsat, biff) Port 512 is an IANA System Port assigned to exec, comsat, and biff over TCP and UDP.	v1
Port 513 (login, who) Port 513 is an IANA System Port assigned to login and who over TCP and UDP.	v1
Port 514 (shell, syslog) Port 514 is an IANA System Port assigned to shell and syslog over TCP and UDP.	v1
Port 515 (printer) Port 515 is an IANA System Port assigned to printer (spooler) over TCP and UDP.	v1
Port 516 (videotex) Port 516 is an IANA System Port assigned to videotex (videotex) over TCP and UDP.	v1
Port 517 (talk) Port 517 is an IANA System Port assigned to talk (like tenex link, but across machine - unfortunately, doesn't use link protocol (this is actually just a rendezvous port from…	v1
Port 518 (ntalk) Port 518 is an IANA System Port assigned to ntalk over TCP and UDP.	v1
Port 519 (utime) Port 519 is an IANA System Port assigned to utime (unixtime) over TCP and UDP.	v1
Port 52 (xns-time) Port 52 is an IANA System Port assigned to xns-time (XNS Time Protocol) over TCP and UDP.	v1
Port 520 (efs, router) Port 520 is an IANA System Port assigned to efs and router over TCP and UDP.	v1
Port 521 (ripng) Port 521 is an IANA System Port assigned to ripng (ripng) over TCP and UDP.	v1
Port 522 (ulp) Port 522 is an IANA System Port assigned to ulp (ULP) over TCP and UDP.	v1
Port 523 (ibm-db2) Port 523 is an IANA System Port assigned to ibm-db2 (IBM-DB2) 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