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Port 4426 (beacon-port-2)

IANA assigns port 4426 to beacon-port-2: SMARTS Beacon Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
beacon-port-2 TCP SMARTS Beacon Port Eyal Yardeni -
beacon-port-2 UDP SMARTS Beacon Port Eyal Yardeni -

Registry dates for this port: registered 2003-11.

Check what is listening on port 4426

Linux: is anything listening on TCP 4426?
sudo ss -tlnp 'sport = :4426'
Linux: UDP 4426
sudo ss -ulnp 'sport = :4426'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4426
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4426 '
Windows (Command Prompt)
netstat -ano | findstr :4426
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4426 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4426
From Windows
Test-NetConnection HOST -Port 4426
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4426

Block port 4426 in the firewall

ufw
sudo ufw deny 4426/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4426 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4426 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4426' -Direction Inbound -Protocol TCP -LocalPort 4426 -Action Block
ufw
sudo ufw deny 4426/udp
iptables
sudo iptables -A INPUT -p udp --dport 4426 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4426 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4426' -Direction Inbound -Protocol UDP -LocalPort 4426 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.