Port 161 — SNMP
Quick reference for TCP/UDP port 161, used by SNMP. Includes what the service does, security guidance and related ports.
What is port 161?
Simple Network Management Protocol — common on routers and switches.
What port does SNMP use?
SNMP listens on port 161 by default.
Security guidance
High risk — do not expose to the internet
Port 161 (SNMP) is high-risk because the service it carries is a frequent target for credential attacks, brute force or unpatched-vulnerability scanning. Keep it bound to localhost or your VPN, never forward it directly on a router, and require strong authentication.
Related ports
Frequently asked
What is port 161 used for?+
Port 161 is the standard TCP/UDP port for SNMP. Simple Network Management Protocol — common on routers and switches.
What port does SNMP use?+
SNMP listens on port 161 by default.
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