1533
IBM Sametime
Low RiskTCP — Messaging
Port Overview
Port Number
1533
Service Name
IBM Sametime
Transport Protocol
TCP
Category
Messaging
Security Risk
Low
Port Range
Registered (1024-49151)
What is Port 1533?
Port 1533 is used by IBM Sametime, an enterprise instant messaging and web conferencing platform. It handles real-time messaging and presence information between Sametime clients and servers. IBM Sametime is commonly deployed in large enterprises alongside IBM Notes/Domino.
TCP
Messaging
Security Considerations
Port 1533 (IBM Sametime) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.