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// Other services

Port 3100: OpCon/xps

Port 3100 is assigned by IANA to opcon-xps (OpCon/xps).

3100

How opcon-xps works

Other services
client:3100opcon-xpsresponse client:3100opcon-xpsresponse

The client sends a request to port 3100 and the opcon-xps 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 3100 dangerous?

We have no specific security note for port 3100. 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 3100

ServicePortTransportDescriptionReferenceUpdated
opcon-xps 3100 TCP, UDP OpCon/xps - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3100'      # process listening on 3100
sudo lsof -nP -i :3100

macOS

sudo lsof -nP -i :3100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3100
netstat -ano | findstr :3100

From another machine

nmap -p 3100 -sV <host>
sudo nmap -sU -p 3100 <host>
nc -zv <host> 3100

Block it in the firewall

sudo ufw deny 3100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3100" -Direction Inbound -LocalPort 3100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3100 used for?

Port 3100 is assigned by IANA to opcon-xps (OpCon/xps).

Is port 3100 TCP or UDP?

Port 3100 is registered for TCP and UDP.

Is it safe to open port 3100?

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 3100 is open?

On Linux run "ss -ltnup 'sport = :3100'", on macOS "lsof -nP -i :3100", and on Windows "netstat -ano | findstr :3100" to see the local process. From another machine, "nmap -p 3100 <host>" shows whether it is reachable.

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