561
monitor
Low RiskUDP — System & Infrastructure
Port Overview
Port Number
561
Service Name
monitor
Transport Protocol
UDP
Category
System & Infrastructure
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 561?
Port 561 is assigned to monitor, for Unix system monitoring data distribution. Completely obsolete.
UDP
System & Infrastructure
Security Considerations
Port 561 (monitor) 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.