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Port 5431 (park-agent)

IANA assigns port 5431 to park-agent: PARK AGENT.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
park-agent TCP PARK AGENT John Clifford -
park-agent UDP PARK AGENT John Clifford -

Check what is listening on port 5431

Linux: is anything listening on TCP 5431?
sudo ss -tlnp 'sport = :5431'
Linux: UDP 5431
sudo ss -ulnp 'sport = :5431'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5431
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5431 '
Windows (Command Prompt)
netstat -ano | findstr :5431
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5431 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5431
From Windows
Test-NetConnection HOST -Port 5431
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5431

Block port 5431 in the firewall

ufw
sudo ufw deny 5431/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5431 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5431 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5431' -Direction Inbound -Protocol TCP -LocalPort 5431 -Action Block
ufw
sudo ufw deny 5431/udp
iptables
sudo iptables -A INPUT -p udp --dport 5431 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5431 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5431' -Direction Inbound -Protocol UDP -LocalPort 5431 -Action Block

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