162
SNMP trap receiver — unsolicited alerts from network devices
SNMP Trap
What is port 162?
SNMP Trap on UDP port 162 is used by network devices (routers, switches, UPS units) to send unsolicited alert notifications to a monitoring server when significant events occur — such as a link going down, high CPU utilization, or an authentication failure. This is the reverse of port 161: instead of the manager polling the device, the device proactively notifies the manager.
Quick checks
$
nc -zv example.com 162
$
nmap -p 162 example.com