9
Discard
Low RiskTCP/UDP — System & Infrastructure
Port Overview
Port Number
9
Service Name
Discard
Transport Protocol
TCP/UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 9?
Discard protocol. Silently discards all received data without sending any response. Also used for Wake-on-LAN (WoL) magic packets over UDP.
TCP/UDP
System & Infrastructure
Commonly Used
Security Considerations
Port 9 (Discard) 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.