TCP Port 522 – ulp

User Locator Service. Used by collaborative apps to track/locate active users (eg: NetMeeting). Security Concerns: Provides valuable user info for user-level attacks. Do not allow across untrusted nets without encryption.

About TCP Port 522

Port 522 is registered with the Internet Assigned Numbers Authority (IANA) for ulp. The IANA description reads: ‘ULP’.

Data Sources

This information is compiled from: IANA Service Name and Transport Protocol Port Number Registry.