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// Other services

Port 2791: MT Port Registrator

Port 2791 is assigned by IANA to mtport-regist (MT Port Registrator).

2791

How mtport-regist works

Other services
client:2791mtport-registresponse client:2791mtport-registresponse

The client sends a request to port 2791 and the mtport-regist 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 2791 dangerous?

We have no specific security note for port 2791. 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 2791

ServicePortTransportDescriptionReferenceUpdated
mtport-regist 2791 TCP, UDP MT Port Registrator - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2791, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2791'      # process listening on 2791
sudo lsof -nP -i :2791

macOS

sudo lsof -nP -i :2791

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2791 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2791
netstat -ano | findstr :2791

From another machine

nmap -p 2791 -sV <host>
sudo nmap -sU -p 2791 <host>
nc -zv <host> 2791

Block it in the firewall

sudo ufw deny 2791/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2791" -Direction Inbound -LocalPort 2791 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2791 used for?

Port 2791 is assigned by IANA to mtport-regist (MT Port Registrator).

Is port 2791 TCP or UDP?

Port 2791 is registered for TCP and UDP.

Is it safe to open port 2791?

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 2791 is open?

On Linux run "ss -ltnup 'sport = :2791'", on macOS "lsof -nP -i :2791", and on Windows "netstat -ano | findstr :2791" to see the local process. From another machine, "nmap -p 2791 <host>" shows whether it is reachable.

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