:156
(TCP/UDP)
Low Risk
SQL Service
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TCP/UDP — Database
Port Overview
Port Number
156
Service Name
SQL Service
Transport Protocol
TCP/UDP
Category
Database
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 156?
Port 156 is an IANA-registered SQL Service port, an early generic placeholder. Unused in contemporary database systems.
TCP/UDP
Database
Security Considerations
Port 156 (SQL Service) 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.