Port 161 — SNMP

UDP · Port 161/UDP is used for Simple Network Management Protocol (SNMP) requests and responses. SNMP is a protocol used to monitor and manage network devices, and this port is critical for remote monitoring and management of network infrastructure. Security relevance lies in the potential for unauthorized access or manipulation of network devices.

Port Number: 161
Service Name: SNMP
Protocol: UDP
Common Software: Net-SNMP, SNMP agent

Security Notes

Review IANA registry for port 161 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 161 used for?

Port 161 is used for SNMP. Port 161/UDP is used for Simple Network Management Protocol (SNMP) requests and responses. SNMP is a protocol used to monitor and manage network devices, and this port is critical for remote monitoring and management of network infrastructure. Security relevance lies in the potential for unauthorized access or manipulation of network devices. Common software: Net-SNMP, SNMP agent.

Is port 161 dangerous to leave open?

Review IANA registry for port 161 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 161 is open?

Use nmap: nmap -p 161 <target> or check locally: ss -tlnp | rg 161