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Port 3124 (beacon-port)

IANA assigns port 3124 to beacon-port: Beacon Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
beacon-port TCP Beacon Port James Paul Duncan -
beacon-port UDP Beacon Port James Paul Duncan -

Check what is listening on port 3124

Linux: is anything listening on TCP 3124?
sudo ss -tlnp 'sport = :3124'
Linux: UDP 3124
sudo ss -ulnp 'sport = :3124'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3124
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3124 '
Windows (Command Prompt)
netstat -ano | findstr :3124
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3124 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3124
From Windows
Test-NetConnection HOST -Port 3124
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3124

Block port 3124 in the firewall

ufw
sudo ufw deny 3124/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3124 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3124 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3124' -Direction Inbound -Protocol TCP -LocalPort 3124 -Action Block
ufw
sudo ufw deny 3124/udp
iptables
sudo iptables -A INPUT -p udp --dport 3124 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3124 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3124' -Direction Inbound -Protocol UDP -LocalPort 3124 -Action Block

Related ports

3122vtr-emulator3123edix3125a13-an3127ctx-bridge

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