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// Other services

Port 41: Graphics

Port 41 is assigned by IANA to graphics (Graphics).

41

How graphics works

Other services
client:41graphicsresponse client:41graphicsresponse

The client sends a request to port 41 and the graphics 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 41 dangerous?

We have no specific security note for port 41. 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 41

ServicePortTransportDescriptionReferenceUpdated
graphics 41 TCP, UDP Graphics - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 41, and is it reachable?

Linux

sudo ss -ltnup 'sport = :41'      # process listening on 41
sudo lsof -nP -i :41

macOS

sudo lsof -nP -i :41

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 41 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 41
netstat -ano | findstr :41

From another machine

nmap -p 41 -sV <host>
sudo nmap -sU -p 41 <host>
nc -zv <host> 41

Block it in the firewall

sudo ufw deny 41/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 41" -Direction Inbound -LocalPort 41 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 41 used for?

Port 41 is assigned by IANA to graphics (Graphics).

Is port 41 TCP or UDP?

Port 41 is registered for TCP and UDP.

Is it safe to open port 41?

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 41 is open?

On Linux run "ss -ltnup 'sport = :41'", on macOS "lsof -nP -i :41", and on Windows "netstat -ano | findstr :41" to see the local process. From another machine, "nmap -p 41 <host>" shows whether it is reachable.

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