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// Other services

Port 3130: ICPv2

Port 3130 is assigned by IANA to icpv2 (ICPv2).

3130

How icpv2 works

Other services
client:3130icpv2response client:3130icpv2response

The client sends a request to port 3130 and the icpv2 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 3130 dangerous?

We have no specific security note for port 3130. 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 3130

ServicePortTransportDescriptionReferenceUpdated
icpv2 3130 TCP, UDP ICPv2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3130, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3130'      # process listening on 3130
sudo lsof -nP -i :3130

macOS

sudo lsof -nP -i :3130

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3130 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3130
netstat -ano | findstr :3130

From another machine

nmap -p 3130 -sV <host>
sudo nmap -sU -p 3130 <host>
nc -zv <host> 3130

Block it in the firewall

sudo ufw deny 3130/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3130" -Direction Inbound -LocalPort 3130 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3130 used for?

Port 3130 is assigned by IANA to icpv2 (ICPv2).

Is port 3130 TCP or UDP?

Port 3130 is registered for TCP and UDP.

Is it safe to open port 3130?

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 3130 is open?

On Linux run "ss -ltnup 'sport = :3130'", on macOS "lsof -nP -i :3130", and on Windows "netstat -ano | findstr :3130" to see the local process. From another machine, "nmap -p 3130 <host>" shows whether it is reachable.

05 Related
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