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// Other services

Port 3967: PPS Message Service

Port 3967 is assigned by IANA to ppsms (PPS Message Service).

3967

How ppsms works

Other services
client:3967ppsmsresponse client:3967ppsmsresponse

The client sends a request to port 3967 and the ppsms 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 3967 dangerous?

We have no specific security note for port 3967. 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 3967

ServicePortTransportDescriptionReferenceUpdated
ppsms 3967 TCP, UDP PPS Message Service - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3967, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3967'      # process listening on 3967
sudo lsof -nP -i :3967

macOS

sudo lsof -nP -i :3967

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3967 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3967
netstat -ano | findstr :3967

From another machine

nmap -p 3967 -sV <host>
sudo nmap -sU -p 3967 <host>
nc -zv <host> 3967

Block it in the firewall

sudo ufw deny 3967/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3967" -Direction Inbound -LocalPort 3967 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3967 used for?

Port 3967 is assigned by IANA to ppsms (PPS Message Service).

Is port 3967 TCP or UDP?

Port 3967 is registered for TCP and UDP.

Is it safe to open port 3967?

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 3967 is open?

On Linux run "ss -ltnup 'sport = :3967'", on macOS "lsof -nP -i :3967", and on Windows "netstat -ano | findstr :3967" to see the local process. From another machine, "nmap -p 3967 <host>" shows whether it is reachable.

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