Port 161

Q: What is port 161?

Monitoring and management of network devices (SNMP) SNMP on UDP port 161 is used to monitor and manage routers, switches, printers, and servers — querying traffic counters, CPU load, memory usage, and more. SNMPv1 and v2c use plaintext community strings (typically "public") instead of passwords, making them highly insecure. This port must be blocked from the internet. Use SNMPv3, which provides proper authentication and encryption.

SNMP

Monitoring and management of network devices (SNMP)

Port

161

Protocol

UDP

Service

SNMP

Security

Dangerous

Full name: Simple Network Management Protocol

What is port 161?

SNMP on UDP port 161 is used to monitor and manage routers, switches, printers, and servers — querying traffic counters, CPU load, memory usage, and more. SNMPv1 and v2c use plaintext community strings (typically "public") instead of passwords, making them highly insecure. This port must be blocked from the internet. Use SNMPv3, which provides proper authentication and encryption.

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