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 121–144 of 686 documents

Document	Version
Port 21 (ftp) Port 21 is an IANA System Port assigned to ftp over TCP, UDP, and SCTP.	v1
Port 210 (z39-50, z39.50) Port 210 is an IANA System Port assigned to z39-50 and z39.50 over TCP and UDP.	v1
Port 211 (914c-g, 914c/g) Port 211 is an IANA System Port assigned to 914c-g and 914c/g over TCP and UDP.	v1
Port 212 (anet) Port 212 is an IANA System Port assigned to anet (ATEXSSTR) over TCP and UDP.	v1
Port 213 (ipx) Port 213 is an IANA System Port assigned to ipx (IPX) over TCP and UDP.	v1
Port 214 (vmpwscs) Port 214 is an IANA System Port assigned to vmpwscs (VM PWSCS) over TCP and UDP.	v1
Port 215 (softpc) Port 215 is an IANA System Port assigned to softpc (Insignia Solutions) over TCP and UDP.	v1
Port 216 (CAIlic) Port 216 is an IANA System Port assigned to CAIlic (Computer Associates Int'l License Server) over TCP and UDP.	v1
Port 217 (dbase) Port 217 is an IANA System Port assigned to dbase (dBASE Unix) over TCP and UDP.	v1
Port 218 (mpp) Port 218 is an IANA System Port assigned to mpp (Netix Message Posting Protocol) over TCP and UDP.	v1
Port 219 (uarps) Port 219 is an IANA System Port assigned to uarps (Unisys ARPs) over TCP and UDP.	v1
Port 22 (ssh) Port 22 is an IANA System Port assigned to ssh over TCP, UDP, and SCTP.	v1
Port 220 (imap3) Port 220 is an IANA System Port assigned to imap3 (Interactive Mail Access Protocol v3) over TCP and UDP.	v1
Port 221 (fln-spx) Port 221 is an IANA System Port assigned to fln-spx (Berkeley rlogind with SPX auth) over TCP and UDP.	v1
Port 222 (rsh-spx) Port 222 is an IANA System Port assigned to rsh-spx (Berkeley rshd with SPX auth) over TCP and UDP.	v1
Port 223 (cdc) Port 223 is an IANA System Port assigned to cdc (Certificate Distribution Center) over TCP and UDP.	v1
Port 224 (masqdialer) Port 224 is an IANA System Port assigned to masqdialer (masqdialer) over TCP and UDP.	v1
Port 23 (telnet) Port 23 is an IANA System Port assigned to telnet (Telnet) over TCP and UDP.	v1
Port 242 (direct) Port 242 is an IANA System Port assigned to direct (Direct) over TCP and UDP.	v1
Port 243 (sur-meas) Port 243 is an IANA System Port assigned to sur-meas (Survey Measurement) over TCP and UDP.	v1
Port 244 (inbusiness) Port 244 is an IANA System Port assigned to inbusiness (inbusiness) over TCP and UDP.	v1
Port 245 (link) Port 245 is an IANA System Port assigned to link (LINK) over TCP and UDP.	v1
Port 246 (dsp3270) Port 246 is an IANA System Port assigned to dsp3270 (Display Systems Protocol) over TCP and UDP.	v1
Port 247 (subntbcst-tftp, subntbcst_tftp) Port 247 is an IANA System Port assigned to subntbcst-tftp and subntbcst_tftp 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