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// Other services

Port 8131: INDIGO-VBCP

Port 8131 is assigned by IANA to indigo-vbcp (INDIGO-VBCP).

8131

How indigo-vbcp works

Other services
client:8131indigo-vbcpresponse client:8131indigo-vbcpresponse

The client sends a request to port 8131 and the indigo-vbcp 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 8131 dangerous?

We have no specific security note for port 8131. 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 8131

ServicePortTransportDescriptionReferenceUpdated
indigo-vbcp 8131 TCP, UDP INDIGO-VBCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8131, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8131'      # process listening on 8131
sudo lsof -nP -i :8131

macOS

sudo lsof -nP -i :8131

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8131 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8131
netstat -ano | findstr :8131

From another machine

nmap -p 8131 -sV <host>
sudo nmap -sU -p 8131 <host>
nc -zv <host> 8131

Block it in the firewall

sudo ufw deny 8131/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8131" -Direction Inbound -LocalPort 8131 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8131 used for?

Port 8131 is assigned by IANA to indigo-vbcp (INDIGO-VBCP).

Is port 8131 TCP or UDP?

Port 8131 is registered for TCP and UDP.

Is it safe to open port 8131?

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 8131 is open?

On Linux run "ss -ltnup 'sport = :8131'", on macOS "lsof -nP -i :8131", and on Windows "netstat -ano | findstr :8131" to see the local process. From another machine, "nmap -p 8131 <host>" shows whether it is reachable.

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