CyberHunter
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// Monitoring & logging

Port 10161: SNMP-DTLS

Port 10161 is assigned by IANA to snmpdtls (SNMP-DTLS), snmptls (SNMP-TLS).

10161

How snmpdtls works

Monitoring & logging
monitoringdevicesnmpdtls monitoringdevicesnmpdtls

The monitoring server collects metrics, alerts or logs from devices over port 10161.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Monitoring & logging
01 Security

Is port 10161 dangerous?

We have no specific security note for port 10161. Its risk depends on the program actually listening on it. General advice for monitoring & logging services:

  • Restrict management and monitoring protocols to the monitoring network.
  • Replace community strings and default credentials.
  • Send logs over TLS.
02 Registry

IANA registry entries for port 10161

ServicePortTransportDescriptionReferenceUpdated
snmpdtls 10161 UDP SNMP-DTLS RFC 6353 -
snmptls 10161 TCP SNMP-TLS RFC 6353 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 10161, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10161'      # process listening on 10161
sudo lsof -nP -i :10161

macOS

sudo lsof -nP -i :10161

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10161 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10161
netstat -ano | findstr :10161

From another machine

nmap -p 10161 -sV <host>
sudo nmap -sU -p 10161 <host>
nc -zv <host> 10161

Block it in the firewall

sudo ufw deny 10161/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10161" -Direction Inbound -LocalPort 10161 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10161 used for?

Port 10161 is assigned by IANA to snmpdtls (SNMP-DTLS), snmptls (SNMP-TLS).

Is port 10161 TCP or UDP?

Port 10161 is registered for UDP and TCP.

Is it safe to open port 10161?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Restrict management and monitoring protocols to the monitoring network.

How do I check if port 10161 is open?

On Linux run "ss -ltnup 'sport = :10161'", on macOS "lsof -nP -i :10161", and on Windows "netstat -ano | findstr :10161" to see the local process. From another machine, "nmap -p 10161 <host>" shows whether it is reachable.

05 Related
:161 SNMP udp · tcp · high risk :162 SNMP trap udp · tcp · moderate risk :9090 Prometheus / admin consoles tcp · udp · high risk :514 Syslog udp · tcp · moderate risk :6514 Syslog over TLS tcp · udp · dccp · low risk :5601 Kibana tcp · udp · high risk :391 SynOptics SNMP Relay Port tcp · udp :412 Trap Convention Port tcp · udp

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