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// Other services

Port 3956: GigE Vision Control

Port 3956 is assigned by IANA to gvcp (GigE Vision Control).

3956

How gvcp works

Other services
client:3956gvcpresponse client:3956gvcpresponse

The client sends a request to port 3956 and the gvcp 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 3956 dangerous?

We have no specific security note for port 3956. 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 3956

ServicePortTransportDescriptionReferenceUpdated
gvcp 3956 TCP, UDP GigE Vision Control - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3956, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3956'      # process listening on 3956
sudo lsof -nP -i :3956

macOS

sudo lsof -nP -i :3956

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3956 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3956
netstat -ano | findstr :3956

From another machine

nmap -p 3956 -sV <host>
sudo nmap -sU -p 3956 <host>
nc -zv <host> 3956

Block it in the firewall

sudo ufw deny 3956/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3956" -Direction Inbound -LocalPort 3956 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3956 used for?

Port 3956 is assigned by IANA to gvcp (GigE Vision Control).

Is port 3956 TCP or UDP?

Port 3956 is registered for TCP and UDP.

Is it safe to open port 3956?

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 3956 is open?

On Linux run "ss -ltnup 'sport = :3956'", on macOS "lsof -nP -i :3956", and on Windows "netstat -ano | findstr :3956" to see the local process. From another machine, "nmap -p 3956 <host>" shows whether it is reachable.

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