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// Other services

Port 164: CMIP/TCP Agent

Port 164 is assigned by IANA to cmip-agent (CMIP/TCP Agent).

164

How cmip-agent works

Other services
client:164cmip-agentresponse client:164cmip-agentresponse

The client sends a request to port 164 and the cmip-agent service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 164 dangerous?

We have no specific security note for port 164. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 164

ServicePortTransportDescriptionReferenceUpdated
cmip-agent 164 TCP, UDP CMIP/TCP Agent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 164, and is it reachable?

Linux

sudo ss -ltnup 'sport = :164'      # process listening on 164
sudo lsof -nP -i :164

macOS

sudo lsof -nP -i :164

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 164 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 164
netstat -ano | findstr :164

From another machine

nmap -p 164 -sV <host>
sudo nmap -sU -p 164 <host>
nc -zv <host> 164

Block it in the firewall

sudo ufw deny 164/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 164" -Direction Inbound -LocalPort 164 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 164 used for?

Port 164 is assigned by IANA to cmip-agent (CMIP/TCP Agent).

Is port 164 TCP or UDP?

Port 164 is registered for TCP and UDP.

Is it safe to open port 164?

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. Close the port if nothing on the host needs it.

How do I check if port 164 is open?

On Linux run "ss -ltnup 'sport = :164'", on macOS "lsof -nP -i :164", and on Windows "netstat -ano | findstr :164" to see the local process. From another machine, "nmap -p 164 <host>" shows whether it is reachable.

05 Related
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