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Port 3812 (neto-wol-server)

IANA assigns port 3812 to neto-wol-server: netO WOL Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
neto-wol-server TCP netO WOL Server Martin Bestmann 2 -
neto-wol-server UDP netO WOL Server Martin Bestmann 2 -

Registry dates for this port: registered 2004-03.

Check what is listening on port 3812

Linux: is anything listening on TCP 3812?
sudo ss -tlnp 'sport = :3812'
Linux: UDP 3812
sudo ss -ulnp 'sport = :3812'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3812
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3812 '
Windows (Command Prompt)
netstat -ano | findstr :3812
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3812 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3812
From Windows
Test-NetConnection HOST -Port 3812
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3812

Block port 3812 in the firewall

ufw
sudo ufw deny 3812/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3812 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3812 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3812' -Direction Inbound -Protocol TCP -LocalPort 3812 -Action Block
ufw
sudo ufw deny 3812/udp
iptables
sudo iptables -A INPUT -p udp --dport 3812 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3812 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3812' -Direction Inbound -Protocol UDP -LocalPort 3812 -Action Block

Related ports

3810wlanauth3811amp3813rap-ip3814neto-dcs

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.