- Use strong credentials and TLS for signalling.
- Rate-limit registrations to stop extension scanning and toll fraud.
- Alert on unexpected chat protocols leaving servers (possible command and control).
Port 4621: Bidirectional single port remote radio VOIP and Control stream
Port 4621 is assigned by IANA to ventoso (Bidirectional single port remote radio VOIP and Control stream).
4621
How ventoso works
Voice & chatPort 4621 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- Transport
- 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
- Voice & chat
Is port 4621 dangerous?
We have no specific security note for port 4621. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 4621
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| ventoso | 4621 | UDP | Bidirectional single port remote radio VOIP and Control stream | - | 2016-03-04 |
| - | 4621 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4621, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4621' # process listening on 4621
sudo lsof -nP -i :4621macOS
sudo lsof -nP -i :4621
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4621 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4621 netstat -ano | findstr :4621
From another machine
nmap -p 4621 -sV <host> sudo nmap -sU -p 4621 <host> nc -zv <host> 4621
Block it in the firewall
sudo ufw deny 4621/udp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4621" -Direction Inbound -LocalPort 4621 -Protocol UDP -Action Block # Windows
What is port 4621 used for?
Port 4621 is assigned by IANA to ventoso (Bidirectional single port remote radio VOIP and Control stream).
Is port 4621 TCP or UDP?
Port 4621 is registered for UDP.
Is it safe to open port 4621?
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. Use strong credentials and TLS for signalling.
How do I check if port 4621 is open?
On Linux run "ss -ltnup 'sport = :4621'", on macOS "lsof -nP -i :4621", and on Windows "netstat -ano | findstr :4621" to see the local process. From another machine, "nmap -p 4621 <host>" shows whether it is reachable.