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// Other services

Port 3783: Impact Mgr./PEM Gateway

Port 3783 is assigned by IANA to bim-pem (Impact Mgr./PEM Gateway).

3783

How bim-pem works

Other services
client:3783bim-pemresponse client:3783bim-pemresponse

The client sends a request to port 3783 and the bim-pem 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 3783 dangerous?

We have no specific security note for port 3783. 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 3783

ServicePortTransportDescriptionReferenceUpdated
bim-pem 3783 TCP, UDP Impact Mgr./PEM Gateway - 2003-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 3783, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3783'      # process listening on 3783
sudo lsof -nP -i :3783

macOS

sudo lsof -nP -i :3783

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3783 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3783
netstat -ano | findstr :3783

From another machine

nmap -p 3783 -sV <host>
sudo nmap -sU -p 3783 <host>
nc -zv <host> 3783

Block it in the firewall

sudo ufw deny 3783/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3783" -Direction Inbound -LocalPort 3783 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3783 used for?

Port 3783 is assigned by IANA to bim-pem (Impact Mgr./PEM Gateway).

Is port 3783 TCP or UDP?

Port 3783 is registered for TCP and UDP.

Is it safe to open port 3783?

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 3783 is open?

On Linux run "ss -ltnup 'sport = :3783'", on macOS "lsof -nP -i :3783", and on Windows "netstat -ano | findstr :3783" to see the local process. From another machine, "nmap -p 3783 <host>" shows whether it is reachable.

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