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Port 5014 (onpsocket)

IANA assigns port 5014 to onpsocket: Overlay Network Protocol.

Registered (user) port, 1024-49151 UDP

Port 5014 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
onpsocket UDP Overlay Network Protocol Roger Matthias -

Registry dates for this port: registered 2009-08-24.

Check what is listening on port 5014

Linux: UDP 5014
sudo ss -ulnp 'sport = :5014'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5014
Windows (Command Prompt)
netstat -ano | findstr :5014
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 5014

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5014

Block port 5014 in the firewall

ufw
sudo ufw deny 5014/udp
iptables
sudo iptables -A INPUT -p udp --dport 5014 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5014 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5014' -Direction Inbound -Protocol UDP -LocalPort 5014 -Action Block

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