Port 4725 (truckstar)

IANA assigns port 4725 to truckstar: TruckStar Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

truckstar TCP TruckStar Service Brian Toothill -

truckstar UDP TruckStar Service Brian Toothill -

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

Linux: is anything listening on TCP 4725?

sudo ss -tlnp 'sport = :4725'

Linux: UDP 4725

sudo ss -ulnp 'sport = :4725'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4725

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4725 '

Windows (Command Prompt)

netstat -ano | findstr :4725

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4725 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4725

From Windows

Test-NetConnection HOST -Port 4725

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 4725

ufw

sudo ufw deny 4725/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4725 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4725 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4725' -Direction Inbound -Protocol TCP -LocalPort 4725 -Action Block

ufw

sudo ufw deny 4725/udp

iptables

sudo iptables -A INPUT -p udp --dport 4725 -j DROP

nftables

sudo nft add rule inet filter input udp dport 4725 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 4725' -Direction Inbound -Protocol UDP -LocalPort 4725 -Action Block

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