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// Other services

Port 3195: Network Control Unit

Port 3195 is assigned by IANA to ncu-1 (Network Control Unit).

3195

How ncu-1 works

Other services
client:3195ncu-1response client:3195ncu-1response

The client sends a request to port 3195 and the ncu-1 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 3195 dangerous?

We have no specific security note for port 3195. 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 3195

ServicePortTransportDescriptionReferenceUpdated
ncu-1 3195 TCP, UDP Network Control Unit - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3195, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3195'      # process listening on 3195
sudo lsof -nP -i :3195

macOS

sudo lsof -nP -i :3195

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3195 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3195
netstat -ano | findstr :3195

From another machine

nmap -p 3195 -sV <host>
sudo nmap -sU -p 3195 <host>
nc -zv <host> 3195

Block it in the firewall

sudo ufw deny 3195/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3195" -Direction Inbound -LocalPort 3195 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3195 used for?

Port 3195 is assigned by IANA to ncu-1 (Network Control Unit).

Is port 3195 TCP or UDP?

Port 3195 is registered for TCP and UDP.

Is it safe to open port 3195?

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 3195 is open?

On Linux run "ss -ltnup 'sport = :3195'", on macOS "lsof -nP -i :3195", and on Windows "netstat -ano | findstr :3195" to see the local process. From another machine, "nmap -p 3195 <host>" shows whether it is reachable.

05 Related
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