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// Other services

Port 6634: MPLS Performance Measurement out-of-band response

Port 6634 is assigned by IANA to mpls-pm (MPLS Performance Measurement out-of-band response).

6634

How mpls-pm works

Other services
client:6634mpls-pmresponse client:6634mpls-pmresponse

The client sends a request to port 6634 and the mpls-pm service answers.

Transport
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 6634 dangerous?

We have no specific security note for port 6634. 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 6634

ServicePortTransportDescriptionReferenceUpdated
mpls-pm 6634 UDP MPLS Performance Measurement out-of-band response - 2014-02-20
-6634-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6634, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6634'      # process listening on 6634
sudo lsof -nP -i :6634

macOS

sudo lsof -nP -i :6634

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6634 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6634
netstat -ano | findstr :6634

From another machine

nmap -p 6634 -sV <host>
sudo nmap -sU -p 6634 <host>
nc -zv <host> 6634

Block it in the firewall

sudo ufw deny 6634/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6634" -Direction Inbound -LocalPort 6634 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 6634 used for?

Port 6634 is assigned by IANA to mpls-pm (MPLS Performance Measurement out-of-band response).

Is port 6634 TCP or UDP?

Port 6634 is registered for UDP.

Is it safe to open port 6634?

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 6634 is open?

On Linux run "ss -ltnup 'sport = :6634'", on macOS "lsof -nP -i :6634", and on Windows "netstat -ano | findstr :6634" to see the local process. From another machine, "nmap -p 6634 <host>" shows whether it is reachable.

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