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Port 4726 (a26-fap-fgw)

IANA assigns port 4726 to a26-fap-fgw: A26 (FAP-FGW).

Registered (user) port, 1024-49151 UDP

Port 4726 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
a26-fap-fgw UDP A26 (FAP-FGW) David Ott -

Registry dates for this port: registered 2010-10-15.

Check what is listening on port 4726

Linux: UDP 4726
sudo ss -ulnp 'sport = :4726'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4726
Windows (Command Prompt)
netstat -ano | findstr :4726
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 4726

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4726

Block port 4726 in the firewall

ufw
sudo ufw deny 4726/udp
iptables
sudo iptables -A INPUT -p udp --dport 4726 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4726 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4726' -Direction Inbound -Protocol UDP -LocalPort 4726 -Action Block

Related ports

4711trinity-dist4725truckstar4727fcis, fcis-disc4728capmux

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