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// Other services

Port 3732: Mobile Wnn

Port 3732 is assigned by IANA to m-wnn (Mobile Wnn).

3732

How m-wnn works

Other services
client:3732m-wnnresponse client:3732m-wnnresponse

The client sends a request to port 3732 and the m-wnn 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 3732 dangerous?

We have no specific security note for port 3732. 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 3732

ServicePortTransportDescriptionReferenceUpdated
m-wnn 3732 TCP, UDP Mobile Wnn - 2003-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3732, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3732'      # process listening on 3732
sudo lsof -nP -i :3732

macOS

sudo lsof -nP -i :3732

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3732 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3732
netstat -ano | findstr :3732

From another machine

nmap -p 3732 -sV <host>
sudo nmap -sU -p 3732 <host>
nc -zv <host> 3732

Block it in the firewall

sudo ufw deny 3732/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3732" -Direction Inbound -LocalPort 3732 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3732 used for?

Port 3732 is assigned by IANA to m-wnn (Mobile Wnn).

Is port 3732 TCP or UDP?

Port 3732 is registered for TCP and UDP.

Is it safe to open port 3732?

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 3732 is open?

On Linux run "ss -ltnup 'sport = :3732'", on macOS "lsof -nP -i :3732", and on Windows "netstat -ano | findstr :3732" to see the local process. From another machine, "nmap -p 3732 <host>" shows whether it is reachable.

05 Related
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