Port 177 — xdmcp

Well-known port 177 (tcp/udp): X Display Manager Control Protocol. Service name: xdmcp.

port kind port status standard verification verified tier A iana-registry-row@1

registry record

value: 177

Service Name	xdmcp
Port Number	177
Transport Protocol	tcp
Description	X Display Manager Control Protocol
Assignee	[Robert_W_Scheifler]
Contact	[Robert_W_Scheifler]
Registration Date
Modification Date
Reference
Service Code
Unauthorized Use Reported
Assignment Notes

source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.csv
version: IANA registry, Last-Modified: Fri, 29 May 2026 01:11:28 GMT
retrieved: 2026-05-29 · updated: 2026-05-29

agent: curl -H 'accept: application/json' wire.phall.io/port/177 or /port/177.json