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// Other services

Port 3801: ibm manager service

Port 3801 is assigned by IANA to ibm-mgr (ibm manager service).

3801

How ibm-mgr works

Other services
client:3801ibm-mgrresponse client:3801ibm-mgrresponse

The client sends a request to port 3801 and the ibm-mgr 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 3801 dangerous?

We have no specific security note for port 3801. 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 3801

ServicePortTransportDescriptionReferenceUpdated
ibm-mgr 3801 TCP, UDP ibm manager service - 2006-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 3801, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3801'      # process listening on 3801
sudo lsof -nP -i :3801

macOS

sudo lsof -nP -i :3801

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3801 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3801
netstat -ano | findstr :3801

From another machine

nmap -p 3801 -sV <host>
sudo nmap -sU -p 3801 <host>
nc -zv <host> 3801

Block it in the firewall

sudo ufw deny 3801/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3801" -Direction Inbound -LocalPort 3801 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3801 used for?

Port 3801 is assigned by IANA to ibm-mgr (ibm manager service).

Is port 3801 TCP or UDP?

Port 3801 is registered for TCP and UDP.

Is it safe to open port 3801?

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 3801 is open?

On Linux run "ss -ltnup 'sport = :3801'", on macOS "lsof -nP -i :3801", and on Windows "netstat -ano | findstr :3801" to see the local process. From another machine, "nmap -p 3801 <host>" shows whether it is reachable.

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