Port 257 — set

Well-known port 257 (tcp/udp): Secure Electronic Transaction. Service name: set.

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

registry record

value: 257

Service Name	set
Port Number	257
Transport Protocol	tcp
Description	Secure Electronic Transaction
Assignee	[Donald_Eastlake]
Contact	[Donald_Eastlake]
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/257 or /port/257.json