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// Other services

Port 167: NAMP

Port 167 is assigned by IANA to namp (NAMP).

167

How namp works

Other services
client:167nampresponse client:167nampresponse

The client sends a request to port 167 and the namp 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 167 dangerous?

We have no specific security note for port 167. 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 167

ServicePortTransportDescriptionReferenceUpdated
namp 167 TCP, UDP NAMP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 167, and is it reachable?

Linux

sudo ss -ltnup 'sport = :167'      # process listening on 167
sudo lsof -nP -i :167

macOS

sudo lsof -nP -i :167

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 167 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 167
netstat -ano | findstr :167

From another machine

nmap -p 167 -sV <host>
sudo nmap -sU -p 167 <host>
nc -zv <host> 167

Block it in the firewall

sudo ufw deny 167/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 167" -Direction Inbound -LocalPort 167 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 167 used for?

Port 167 is assigned by IANA to namp (NAMP).

Is port 167 TCP or UDP?

Port 167 is registered for TCP and UDP.

Is it safe to open port 167?

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 167 is open?

On Linux run "ss -ltnup 'sport = :167'", on macOS "lsof -nP -i :167", and on Windows "netstat -ano | findstr :167" to see the local process. From another machine, "nmap -p 167 <host>" shows whether it is reachable.

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