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// Other services

Port 3812: netO WOL Server

Port 3812 is assigned by IANA to neto-wol-server (netO WOL Server).

3812

How neto-wol-server works

Other services
client:3812neto-wol-serverresponse client:3812neto-wol-serverresponse

The client sends a request to port 3812 and the neto-wol-server 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 3812 dangerous?

We have no specific security note for port 3812. 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 3812

ServicePortTransportDescriptionReferenceUpdated
neto-wol-server 3812 TCP, UDP netO WOL Server - 2004-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 3812, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3812'      # process listening on 3812
sudo lsof -nP -i :3812

macOS

sudo lsof -nP -i :3812

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3812 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3812
netstat -ano | findstr :3812

From another machine

nmap -p 3812 -sV <host>
sudo nmap -sU -p 3812 <host>
nc -zv <host> 3812

Block it in the firewall

sudo ufw deny 3812/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3812" -Direction Inbound -LocalPort 3812 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3812 used for?

Port 3812 is assigned by IANA to neto-wol-server (netO WOL Server).

Is port 3812 TCP or UDP?

Port 3812 is registered for TCP and UDP.

Is it safe to open port 3812?

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 3812 is open?

On Linux run "ss -ltnup 'sport = :3812'", on macOS "lsof -nP -i :3812", and on Windows "netstat -ano | findstr :3812" to see the local process. From another machine, "nmap -p 3812 <host>" shows whether it is reachable.

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