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Port 6363 (ndn)

IANA assigns port 6363 to ndn: Named Data Networking.

Registered (user) port, 1024-49151 UDP

Port 6363 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
ndn UDP Named Data Networking Regents of the University of California -

Registry dates for this port: registered 2013-10-30.

Check what is listening on port 6363

Linux: UDP 6363
sudo ss -ulnp 'sport = :6363'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6363
Windows (Command Prompt)
netstat -ano | findstr :6363
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 6363

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6363

Block port 6363 in the firewall

ufw
sudo ufw deny 6363/udp
iptables
sudo iptables -A INPUT -p udp --dport 6363 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6363 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6363' -Direction Inbound -Protocol UDP -LocalPort 6363 -Action Block

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