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Port 494 (pov-ray)

IANA assigns port 494 to pov-ray: POV-Ray.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pov-ray TCP POV-Ray POV Team Co ordinato -
pov-ray UDP POV-Ray POV Team Co ordinato -

Check what is listening on port 494

Linux: is anything listening on TCP 494?
sudo ss -tlnp 'sport = :494'
Linux: UDP 494
sudo ss -ulnp 'sport = :494'
Linux / macOS: which process owns the port
sudo lsof -nP -i :494
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':494 '
Windows (Command Prompt)
netstat -ano | findstr :494
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 494 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 494
From Windows
Test-NetConnection HOST -Port 494
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 494

Block port 494 in the firewall

ufw
sudo ufw deny 494/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 494 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 494 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 494' -Direction Inbound -Protocol TCP -LocalPort 494 -Action Block
ufw
sudo ufw deny 494/udp
iptables
sudo iptables -A INPUT -p udp --dport 494 -j DROP
nftables
sudo nft add rule inet filter input udp dport 494 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 494' -Direction Inbound -Protocol UDP -LocalPort 494 -Action Block

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