- 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 3654: VAP RealTime Messenger
Port 3654 is assigned by IANA to vaprtm (VAP RealTime Messenger).
3654
How vaprtm works
Voice & chatPort 3654 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- 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
- Voice & chat
Is port 3654 dangerous?
We have no specific security note for port 3654. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 3654
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| vaprtm | 3654 | TCP, UDP | VAP RealTime Messenger | - | 2003-01 |
// source: IANA service name and port number registry
Which program uses port 3654, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3654' # process listening on 3654
sudo lsof -nP -i :3654macOS
sudo lsof -nP -i :3654
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3654 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3654 netstat -ano | findstr :3654
From another machine
nmap -p 3654 -sV <host> sudo nmap -sU -p 3654 <host> nc -zv <host> 3654
Block it in the firewall
sudo ufw deny 3654/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3654" -Direction Inbound -LocalPort 3654 -Protocol TCP -Action Block # Windows
What is port 3654 used for?
Port 3654 is assigned by IANA to vaprtm (VAP RealTime Messenger).
Is port 3654 TCP or UDP?
Port 3654 is registered for TCP and UDP.
Is it safe to open port 3654?
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 3654 is open?
On Linux run "ss -ltnup 'sport = :3654'", on macOS "lsof -nP -i :3654", and on Windows "netstat -ano | findstr :3654" to see the local process. From another machine, "nmap -p 3654 <host>" shows whether it is reachable.