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// Other services

Port 5031: Direct Message Protocol

Port 5031 is assigned by IANA to dmp (Direct Message Protocol).

5031

How dmp works

Other services
client:5031dmpresponse client:5031dmpresponse

The client sends a request to port 5031 and the dmp 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 5031 dangerous?

We have no specific security note for port 5031. 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 5031

ServicePortTransportDescriptionReferenceUpdated
dmp 5031 UDP Direct Message Protocol - 2009-09-30
-5031-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5031, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5031'      # process listening on 5031
sudo lsof -nP -i :5031

macOS

sudo lsof -nP -i :5031

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5031 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5031
netstat -ano | findstr :5031

From another machine

nmap -p 5031 -sV <host>
sudo nmap -sU -p 5031 <host>
nc -zv <host> 5031

Block it in the firewall

sudo ufw deny 5031/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5031" -Direction Inbound -LocalPort 5031 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 5031 used for?

Port 5031 is assigned by IANA to dmp (Direct Message Protocol).

Is port 5031 TCP or UDP?

Port 5031 is registered for UDP.

Is it safe to open port 5031?

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 5031 is open?

On Linux run "ss -ltnup 'sport = :5031'", on macOS "lsof -nP -i :5031", and on Windows "netstat -ano | findstr :5031" to see the local process. From another machine, "nmap -p 5031 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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