CyberHunter
Local dataset, no network
// Other services

Port 611: npmp-gui

Port 611 is assigned by IANA to npmp-gui (npmp-gui).

611

How npmp-gui works

Other services
client:611npmp-guiresponse client:611npmp-guiresponse

The client sends a request to port 611 and the npmp-gui 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 611 dangerous?

We have no specific security note for port 611. 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 611

ServicePortTransportDescriptionReferenceUpdated
npmp-gui 611 TCP, UDP npmp-gui - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 611, and is it reachable?

Linux

sudo ss -ltnup 'sport = :611'      # process listening on 611
sudo lsof -nP -i :611

macOS

sudo lsof -nP -i :611

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 611 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 611
netstat -ano | findstr :611

From another machine

nmap -p 611 -sV <host>
sudo nmap -sU -p 611 <host>
nc -zv <host> 611

Block it in the firewall

sudo ufw deny 611/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 611" -Direction Inbound -LocalPort 611 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 611 used for?

Port 611 is assigned by IANA to npmp-gui (npmp-gui).

Is port 611 TCP or UDP?

Port 611 is registered for TCP and UDP.

Is it safe to open port 611?

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 611 is open?

On Linux run "ss -ltnup 'sport = :611'", on macOS "lsof -nP -i :611", and on Windows "netstat -ano | findstr :611" to see the local process. From another machine, "nmap -p 611 <host>" shows whether it is reachable.

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