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Port 3363 (nati-vi-server)

IANA assigns port 3363 to nati-vi-server: NATI Vi Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nati-vi-server TCP NATI Vi Server National Instruments 2 -
nati-vi-server UDP NATI Vi Server National Instruments 2 -

Check what is listening on port 3363

Linux: is anything listening on TCP 3363?
sudo ss -tlnp 'sport = :3363'
Linux: UDP 3363
sudo ss -ulnp 'sport = :3363'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3363
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3363 '
Windows (Command Prompt)
netstat -ano | findstr :3363
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3363 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3363
From Windows
Test-NetConnection HOST -Port 3363
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3363

Block port 3363 in the firewall

ufw
sudo ufw deny 3363/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3363 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3363 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3363' -Direction Inbound -Protocol TCP -LocalPort 3363 -Action Block
ufw
sudo ufw deny 3363/udp
iptables
sudo iptables -A INPUT -p udp --dport 3363 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3363 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3363' -Direction Inbound -Protocol UDP -LocalPort 3363 -Action Block

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