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Port 649 (cadview-3d)

IANA assigns port 649 to cadview-3d: Cadview-3d - streaming 3d models over the internet.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
cadview-3d TCP Cadview-3d - streaming 3d models over the internet David Cooper -
cadview-3d UDP Cadview-3d - streaming 3d models over the internet David Cooper -

Check what is listening on port 649

Linux: is anything listening on TCP 649?
sudo ss -tlnp 'sport = :649'
Linux: UDP 649
sudo ss -ulnp 'sport = :649'
Linux / macOS: which process owns the port
sudo lsof -nP -i :649
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':649 '
Windows (Command Prompt)
netstat -ano | findstr :649
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 649 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 649
From Windows
Test-NetConnection HOST -Port 649
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 649

Block port 649 in the firewall

ufw
sudo ufw deny 649/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 649 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 649 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 649' -Direction Inbound -Protocol TCP -LocalPort 649 -Action Block
ufw
sudo ufw deny 649/udp
iptables
sudo iptables -A INPUT -p udp --dport 649 -j DROP
nftables
sudo nft add rule inet filter input udp dport 649 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 649' -Direction Inbound -Protocol UDP -LocalPort 649 -Action Block

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