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// Other services

Port 7401: RTPS Data-Distribution User-Traffic

Port 7401 is assigned by IANA to rtps-dd-ut (RTPS Data-Distribution User-Traffic).

7401

How rtps-dd-ut works

Other services
client:7401rtps-dd-utresponse client:7401rtps-dd-utresponse

The client sends a request to port 7401 and the rtps-dd-ut 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 7401 dangerous?

We have no specific security note for port 7401. 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 7401

ServicePortTransportDescriptionReferenceUpdated
rtps-dd-ut 7401 TCP, UDP RTPS Data-Distribution User-Traffic - 2005-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 7401, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7401'      # process listening on 7401
sudo lsof -nP -i :7401

macOS

sudo lsof -nP -i :7401

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7401 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7401
netstat -ano | findstr :7401

From another machine

nmap -p 7401 -sV <host>
sudo nmap -sU -p 7401 <host>
nc -zv <host> 7401

Block it in the firewall

sudo ufw deny 7401/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7401" -Direction Inbound -LocalPort 7401 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7401 used for?

Port 7401 is assigned by IANA to rtps-dd-ut (RTPS Data-Distribution User-Traffic).

Is port 7401 TCP or UDP?

Port 7401 is registered for TCP and UDP.

Is it safe to open port 7401?

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 7401 is open?

On Linux run "ss -ltnup 'sport = :7401'", on macOS "lsof -nP -i :7401", and on Windows "netstat -ano | findstr :7401" to see the local process. From another machine, "nmap -p 7401 <host>" shows whether it is reachable.

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