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Port 3729 (fksp-audit)

IANA assigns port 3729 to fksp-audit: Fireking Audit Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fksp-audit TCP Fireking Audit Port Richard Thurman -
fksp-audit UDP Fireking Audit Port Richard Thurman -

Registry dates for this port: registered 2003-04.

Check what is listening on port 3729

Linux: is anything listening on TCP 3729?
sudo ss -tlnp 'sport = :3729'
Linux: UDP 3729
sudo ss -ulnp 'sport = :3729'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3729
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3729 '
Windows (Command Prompt)
netstat -ano | findstr :3729
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3729 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3729
From Windows
Test-NetConnection HOST -Port 3729
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3729

Block port 3729 in the firewall

ufw
sudo ufw deny 3729/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3729 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3729 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3729' -Direction Inbound -Protocol TCP -LocalPort 3729 -Action Block
ufw
sudo ufw deny 3729/udp
iptables
sudo iptables -A INPUT -p udp --dport 3729 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3729 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3729' -Direction Inbound -Protocol UDP -LocalPort 3729 -Action Block

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3727e-mdu3728e-woa3730client-ctrl3731smap

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