Port 5031Direct Message Protocol

UDP port 5031 is assigned to the Direct Message Protocol, but no established public deployment is known.

transport: udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as dmp

1 other service is registered on port 5031. compare all 2 →

Technical Details

what runs on :5031

Direct Message Protocol is registered on port :5031 over udp to Gjermund Wallenius, assigned September 2009. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :5031

this machine

# linux
sudo ss -ulpn 'sport = :5031'

# macos / bsd
sudo lsof -nP -i :5031

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5031

another host

sudo nmap -sU -sV -p U:5031 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :5031

risk score

1/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

no security notes recorded for :5031 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :5031
service: Direct Message Protocol
transport: UDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA assignment identifies this as the Direct Message Protocol and names Gjermund Wallenius as the registrant. No widely established product or public deployment is known to commonly use it.
lookups: 0rank 993
added: 2026-10-06
updated: 2026-10-06
references: IANA service name registry — port 5031

Something wrong?

This record is maintained by the engineers who use port 5031. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-06.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :5031, by lookups.

port	service	proto	category	risk	views
:5001	Iperf	TCPUDP	Network Services	caution	27.7k
:5001	Commplex-Link	TCP	Network Services	caution	24.9k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:5000	Commplex Main	TCP	Web Services	caution	15.4k
:5070	BFCP	TCP	Network Services	caution	15.2k
:5061	SIP over TLS	TCP	Security	caution	14.4k
:5093	SafeNet License Manager	UDP	System	caution	13.3k
:5004	RTP Media Data	TCP	Streaming	safe	13.0k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :5031Direct Message Protocol

Technical Details

Security Information

Related Ports

Port 5031Direct Message Protocol