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// Other services

Port 3875: PNBSCADA

Port 3875 is assigned by IANA to pnbscada (PNBSCADA).

3875

How pnbscada works

Other services
client:3875pnbscadaresponse client:3875pnbscadaresponse

The client sends a request to port 3875 and the pnbscada 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 3875 dangerous?

We have no specific security note for port 3875. 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 3875

ServicePortTransportDescriptionReferenceUpdated
pnbscada 3875 TCP, UDP PNBSCADA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3875, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3875'      # process listening on 3875
sudo lsof -nP -i :3875

macOS

sudo lsof -nP -i :3875

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3875 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3875
netstat -ano | findstr :3875

From another machine

nmap -p 3875 -sV <host>
sudo nmap -sU -p 3875 <host>
nc -zv <host> 3875

Block it in the firewall

sudo ufw deny 3875/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3875" -Direction Inbound -LocalPort 3875 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3875 used for?

Port 3875 is assigned by IANA to pnbscada (PNBSCADA).

Is port 3875 TCP or UDP?

Port 3875 is registered for TCP and UDP.

Is it safe to open port 3875?

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 3875 is open?

On Linux run "ss -ltnup 'sport = :3875'", on macOS "lsof -nP -i :3875", and on Windows "netstat -ano | findstr :3875" to see the local process. From another machine, "nmap -p 3875 <host>" shows whether it is reachable.

05 Related
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