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// Other services

Port 2905: M3UA

Port 2905 is assigned by IANA to m3ua (M3UA).

2905

How m3ua works

Other services
client:2905m3uaresponse client:2905m3uaresponse

The client sends a request to port 2905 and the m3ua service answers.

Transport
TCP · SCTP
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 2905 dangerous?

We have no specific security note for port 2905. 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 2905

ServicePortTransportDescriptionReferenceUpdated
m3ua 2905 TCP, SCTP M3UA RFC 4666 -
-2905-De-registered--

// source: IANA service name and port number registry

03 Check it

Which program uses port 2905, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2905'      # process listening on 2905
sudo lsof -nP -i :2905

macOS

sudo lsof -nP -i :2905

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2905 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2905
netstat -ano | findstr :2905

From another machine

nmap -p 2905 -sV <host>
nc -zv <host> 2905

Block it in the firewall

sudo ufw deny 2905/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2905" -Direction Inbound -LocalPort 2905 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2905 used for?

Port 2905 is assigned by IANA to m3ua (M3UA).

Is port 2905 TCP or UDP?

Port 2905 is registered for TCP and SCTP.

Is it safe to open port 2905?

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 2905 is open?

On Linux run "ss -ltnup 'sport = :2905'", on macOS "lsof -nP -i :2905", and on Windows "netstat -ano | findstr :2905" to see the local process. From another machine, "nmap -p 2905 <host>" shows whether it is reachable.

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