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// Other services

Port 649: Cadview-3d - streaming 3d models over the internet

Port 649 is assigned by IANA to cadview-3d (Cadview-3d - streaming 3d models over the internet).

649

How cadview-3d works

Other services
client:649cadview-3dresponse client:649cadview-3dresponse

The client sends a request to port 649 and the cadview-3d service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 649 dangerous?

We have no specific security note for port 649. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 649

ServicePortTransportDescriptionReferenceUpdated
cadview-3d 649 TCP, UDP Cadview-3d - streaming 3d models over the internet - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 649, and is it reachable?

Linux

sudo ss -ltnup 'sport = :649'      # process listening on 649
sudo lsof -nP -i :649

macOS

sudo lsof -nP -i :649

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 649 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 649
netstat -ano | findstr :649

From another machine

nmap -p 649 -sV <host>
sudo nmap -sU -p 649 <host>
nc -zv <host> 649

Block it in the firewall

sudo ufw deny 649/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 649" -Direction Inbound -LocalPort 649 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 649 used for?

Port 649 is assigned by IANA to cadview-3d (Cadview-3d - streaming 3d models over the internet).

Is port 649 TCP or UDP?

Port 649 is registered for TCP and UDP.

Is it safe to open port 649?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 649 is open?

On Linux run "ss -ltnup 'sport = :649'", on macOS "lsof -nP -i :649", and on Windows "netstat -ano | findstr :649" to see the local process. From another machine, "nmap -p 649 <host>" shows whether it is reachable.

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