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Port 3811 (amp)

IANA assigns port 3811 to amp: AMP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
amp TCP AMP Northon Rodrigues -
amp UDP AMP Northon Rodrigues -

Registry dates for this port: registered 2004-02.

Check what is listening on port 3811

Linux: is anything listening on TCP 3811?
sudo ss -tlnp 'sport = :3811'
Linux: UDP 3811
sudo ss -ulnp 'sport = :3811'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3811
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3811 '
Windows (Command Prompt)
netstat -ano | findstr :3811
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3811 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3811
From Windows
Test-NetConnection HOST -Port 3811
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3811

Block port 3811 in the firewall

ufw
sudo ufw deny 3811/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3811 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3811 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3811' -Direction Inbound -Protocol TCP -LocalPort 3811 -Action Block
ufw
sudo ufw deny 3811/udp
iptables
sudo iptables -A INPUT -p udp --dport 3811 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3811 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3811' -Direction Inbound -Protocol UDP -LocalPort 3811 -Action Block

Related ports

3809apocd3810wlanauth3812neto-wol-server3813rap-ip

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