- Require authentication on cameras and media servers.
- Keep IP cameras and recorders off the Internet; use a VPN for remote viewing.
- Update device firmware.
Port 3791: TV NetworkVideo Data port
Port 3791 is assigned by IANA to tvnetworkvideo (TV NetworkVideo Data port).
3791
How tvnetworkvideo works
Media & streamingThe device streams video frames over port 3791, continuously, as they are captured.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- Media & streaming
Is port 3791 dangerous?
We have no specific security note for port 3791. Its risk depends on the program actually listening on it. General advice for media & streaming services:
IANA registry entries for port 3791
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| tvnetworkvideo | 3791 | TCP, UDP | TV NetworkVideo Data port | - | 2003-07 |
// source: IANA service name and port number registry
Which program uses port 3791, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3791' # process listening on 3791
sudo lsof -nP -i :3791macOS
sudo lsof -nP -i :3791
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3791 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3791 netstat -ano | findstr :3791
From another machine
nmap -p 3791 -sV <host> sudo nmap -sU -p 3791 <host> nc -zv <host> 3791
Block it in the firewall
sudo ufw deny 3791/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3791" -Direction Inbound -LocalPort 3791 -Protocol TCP -Action Block # Windows
What is port 3791 used for?
Port 3791 is assigned by IANA to tvnetworkvideo (TV NetworkVideo Data port).
Is port 3791 TCP or UDP?
Port 3791 is registered for TCP and UDP.
Is it safe to open port 3791?
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. Require authentication on cameras and media servers.
How do I check if port 3791 is open?
On Linux run "ss -ltnup 'sport = :3791'", on macOS "lsof -nP -i :3791", and on Windows "netstat -ano | findstr :3791" to see the local process. From another machine, "nmap -p 3791 <host>" shows whether it is reachable.