- 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 4605: Direct End to End Secure Chat Protocol
Port 4605 is assigned by IANA to sixchat (Direct End to End Secure Chat Protocol).
4605
How sixchat works
Voice & chatPort 4605 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- Transport
- TCP
- 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 4605 dangerous?
We have no specific security note for port 4605. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 4605
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| sixchat | 4605 | TCP | Direct End to End Secure Chat Protocol | - | 2014-09-11 |
| - | 4605 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 4605, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4605' # process listening on 4605
sudo lsof -nP -i :4605macOS
sudo lsof -nP -i :4605
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4605 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4605 netstat -ano | findstr :4605
From another machine
nmap -p 4605 -sV <host> nc -zv <host> 4605
Block it in the firewall
sudo ufw deny 4605/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4605" -Direction Inbound -LocalPort 4605 -Protocol TCP -Action Block # Windows
What is port 4605 used for?
Port 4605 is assigned by IANA to sixchat (Direct End to End Secure Chat Protocol).
Is port 4605 TCP or UDP?
Port 4605 is registered for TCP.
Is it safe to open port 4605?
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 4605 is open?
On Linux run "ss -ltnup 'sport = :4605'", on macOS "lsof -nP -i :4605", and on Windows "netstat -ano | findstr :4605" to see the local process. From another machine, "nmap -p 4605 <host>" shows whether it is reachable.