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// Other services

Port 3727: Ericsson Mobile Data Unit

Port 3727 is assigned by IANA to e-mdu (Ericsson Mobile Data Unit).

3727

How e-mdu works

Other services
client:3727e-mduresponse client:3727e-mduresponse

The client sends a request to port 3727 and the e-mdu 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 3727 dangerous?

We have no specific security note for port 3727. 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 3727

ServicePortTransportDescriptionReferenceUpdated
e-mdu 3727 TCP, UDP Ericsson Mobile Data Unit - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3727, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3727'      # process listening on 3727
sudo lsof -nP -i :3727

macOS

sudo lsof -nP -i :3727

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3727 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3727
netstat -ano | findstr :3727

From another machine

nmap -p 3727 -sV <host>
sudo nmap -sU -p 3727 <host>
nc -zv <host> 3727

Block it in the firewall

sudo ufw deny 3727/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3727" -Direction Inbound -LocalPort 3727 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3727 used for?

Port 3727 is assigned by IANA to e-mdu (Ericsson Mobile Data Unit).

Is port 3727 TCP or UDP?

Port 3727 is registered for TCP and UDP.

Is it safe to open port 3727?

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 3727 is open?

On Linux run "ss -ltnup 'sport = :3727'", on macOS "lsof -nP -i :3727", and on Windows "netstat -ano | findstr :3727" to see the local process. From another machine, "nmap -p 3727 <host>" shows whether it is reachable.

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