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// Other services

Port 3181: BMC Patrol Agent

Port 3181 is assigned by IANA to bmcpatrolagent (BMC Patrol Agent).

3181

How bmcpatrolagent works

Other services
client:3181bmcpatrolagentresponse client:3181bmcpatrolagentresponse

The client sends a request to port 3181 and the bmcpatrolagent 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 3181 dangerous?

We have no specific security note for port 3181. 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 3181

ServicePortTransportDescriptionReferenceUpdated
bmcpatrolagent 3181 TCP, UDP BMC Patrol Agent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3181, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3181'      # process listening on 3181
sudo lsof -nP -i :3181

macOS

sudo lsof -nP -i :3181

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3181 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3181
netstat -ano | findstr :3181

From another machine

nmap -p 3181 -sV <host>
sudo nmap -sU -p 3181 <host>
nc -zv <host> 3181

Block it in the firewall

sudo ufw deny 3181/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3181" -Direction Inbound -LocalPort 3181 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3181 used for?

Port 3181 is assigned by IANA to bmcpatrolagent (BMC Patrol Agent).

Is port 3181 TCP or UDP?

Port 3181 is registered for TCP and UDP.

Is it safe to open port 3181?

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 3181 is open?

On Linux run "ss -ltnup 'sport = :3181'", on macOS "lsof -nP -i :3181", and on Windows "netstat -ano | findstr :3181" to see the local process. From another machine, "nmap -p 3181 <host>" shows whether it is reachable.

05 Related
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