- 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 8501: CYTEL Message Transfer Audio and Video
Port 8501 is assigned by IANA to cmtp-av (CYTEL Message Transfer Audio and Video), cmtp-mgt (CYTEL Message Transfer Management).
8501
How cmtp-av works
Media & streamingThe device streams video frames over port 8501, continuously, as they are captured.
- Transport
- UDP · TCP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned2 registered services
- Range
- Registered (1024-49151)
- Category
- Media & streaming
Is port 8501 dangerous?
We have no specific security note for port 8501. Its risk depends on the program actually listening on it. General advice for media & streaming services:
IANA registry entries for port 8501
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| cmtp-av | 8501 | UDP | CYTEL Message Transfer Audio and Video | - | 2011-04-29 |
| cmtp-mgt | 8501 | TCP | CYTEL Message Transfer Management | - | - |
// source: IANA service name and port number registry
Which program uses port 8501, and is it reachable?
Linux
sudo ss -ltnup 'sport = :8501' # process listening on 8501
sudo lsof -nP -i :8501macOS
sudo lsof -nP -i :8501
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8501 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 8501 netstat -ano | findstr :8501
From another machine
nmap -p 8501 -sV <host> sudo nmap -sU -p 8501 <host> nc -zv <host> 8501
Block it in the firewall
sudo ufw deny 8501/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 8501" -Direction Inbound -LocalPort 8501 -Protocol TCP -Action Block # Windows
What is port 8501 used for?
Port 8501 is assigned by IANA to cmtp-av (CYTEL Message Transfer Audio and Video), cmtp-mgt (CYTEL Message Transfer Management).
Is port 8501 TCP or UDP?
Port 8501 is registered for UDP and TCP.
Is it safe to open port 8501?
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 8501 is open?
On Linux run "ss -ltnup 'sport = :8501'", on macOS "lsof -nP -i :8501", and on Windows "netstat -ano | findstr :8501" to see the local process. From another machine, "nmap -p 8501 <host>" shows whether it is reachable.