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Port 6317 (nav-data-cmd, nav-data)

IANA assigns port 6317 to nav-data-cmd, nav-data: Navtech Radar Sensor Data Command.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nav-data-cmd TCP Navtech Radar Sensor Data Command Navtech Radar Ltd -
nav-data UDP Navtech Radar Sensor Data Navtech Radar Ltd -

Registry dates for this port: registered 2013-02-20.

Check what is listening on port 6317

Linux: is anything listening on TCP 6317?
sudo ss -tlnp 'sport = :6317'
Linux: UDP 6317
sudo ss -ulnp 'sport = :6317'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6317
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6317 '
Windows (Command Prompt)
netstat -ano | findstr :6317
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6317 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6317
From Windows
Test-NetConnection HOST -Port 6317
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6317

Block port 6317 in the firewall

ufw
sudo ufw deny 6317/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6317 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6317 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6317' -Direction Inbound -Protocol TCP -LocalPort 6317 -Action Block
ufw
sudo ufw deny 6317/udp
iptables
sudo iptables -A INPUT -p udp --dport 6317 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6317 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6317' -Direction Inbound -Protocol UDP -LocalPort 6317 -Action Block

Related ports

6315scup, scup-disc6316abb-escp6318iona-data6320repsvc

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