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// Other services

Port 2131: Avantageb2b

Port 2131 is assigned by IANA to avantageb2b (Avantageb2b).

2131

How avantageb2b works

Other services
client:2131avantageb2bresponse client:2131avantageb2bresponse

The client sends a request to port 2131 and the avantageb2b 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 2131 dangerous?

We have no specific security note for port 2131. 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 2131

ServicePortTransportDescriptionReferenceUpdated
avantageb2b 2131 TCP, UDP Avantageb2b - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2131, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2131'      # process listening on 2131
sudo lsof -nP -i :2131

macOS

sudo lsof -nP -i :2131

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2131 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2131
netstat -ano | findstr :2131

From another machine

nmap -p 2131 -sV <host>
sudo nmap -sU -p 2131 <host>
nc -zv <host> 2131

Block it in the firewall

sudo ufw deny 2131/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2131" -Direction Inbound -LocalPort 2131 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2131 used for?

Port 2131 is assigned by IANA to avantageb2b (Avantageb2b).

Is port 2131 TCP or UDP?

Port 2131 is registered for TCP and UDP.

Is it safe to open port 2131?

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 2131 is open?

On Linux run "ss -ltnup 'sport = :2131'", on macOS "lsof -nP -i :2131", and on Windows "netstat -ano | findstr :2131" to see the local process. From another machine, "nmap -p 2131 <host>" shows whether it is reachable.

05 Related
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