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// Other services

Port 6161: PATROL Internet Srv Mgr

Port 6161 is assigned by IANA to patrol-ism (PATROL Internet Srv Mgr).

6161

How patrol-ism works

Other services
client:6161patrol-ismresponse client:6161patrol-ismresponse

The client sends a request to port 6161 and the patrol-ism 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 6161 dangerous?

We have no specific security note for port 6161. 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 6161

ServicePortTransportDescriptionReferenceUpdated
patrol-ism 6161 TCP, UDP PATROL Internet Srv Mgr - 2005-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 6161, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6161'      # process listening on 6161
sudo lsof -nP -i :6161

macOS

sudo lsof -nP -i :6161

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6161 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6161
netstat -ano | findstr :6161

From another machine

nmap -p 6161 -sV <host>
sudo nmap -sU -p 6161 <host>
nc -zv <host> 6161

Block it in the firewall

sudo ufw deny 6161/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6161" -Direction Inbound -LocalPort 6161 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6161 used for?

Port 6161 is assigned by IANA to patrol-ism (PATROL Internet Srv Mgr).

Is port 6161 TCP or UDP?

Port 6161 is registered for TCP and UDP.

Is it safe to open port 6161?

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 6161 is open?

On Linux run "ss -ltnup 'sport = :6161'", on macOS "lsof -nP -i :6161", and on Windows "netstat -ano | findstr :6161" to see the local process. From another machine, "nmap -p 6161 <host>" shows whether it is reachable.

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