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// Other services

Port 163: CMIP/TCP Manager

Port 163 is assigned by IANA to cmip-man (CMIP/TCP Manager).

163

How cmip-man works

Other services
client:163cmip-manresponse client:163cmip-manresponse

The client sends a request to port 163 and the cmip-man 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 163 dangerous?

We have no specific security note for port 163. 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 163

ServicePortTransportDescriptionReferenceUpdated
cmip-man 163 TCP, UDP CMIP/TCP Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 163, and is it reachable?

Linux

sudo ss -ltnup 'sport = :163'      # process listening on 163
sudo lsof -nP -i :163

macOS

sudo lsof -nP -i :163

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 163 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 163
netstat -ano | findstr :163

From another machine

nmap -p 163 -sV <host>
sudo nmap -sU -p 163 <host>
nc -zv <host> 163

Block it in the firewall

sudo ufw deny 163/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 163" -Direction Inbound -LocalPort 163 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 163 used for?

Port 163 is assigned by IANA to cmip-man (CMIP/TCP Manager).

Is port 163 TCP or UDP?

Port 163 is registered for TCP and UDP.

Is it safe to open port 163?

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 163 is open?

On Linux run "ss -ltnup 'sport = :163'", on macOS "lsof -nP -i :163", and on Windows "netstat -ano | findstr :163" to see the local process. From another machine, "nmap -p 163 <host>" shows whether it is reachable.

05 Related
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