- 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 12345: Italk Chat System
Port 12345 is assigned by IANA to italk (Italk Chat System).
12345
How italk works
Voice & chatPort 12345 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 12345 dangerous?
We have no specific security note for port 12345. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 12345
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| italk | 12345 | TCP, UDP | Italk Chat System | - | - |
// source: IANA service name and port number registry
Which program uses port 12345, and is it reachable?
Linux
sudo ss -ltnup 'sport = :12345' # process listening on 12345
sudo lsof -nP -i :12345macOS
sudo lsof -nP -i :12345
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12345 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 12345 netstat -ano | findstr :12345
From another machine
nmap -p 12345 -sV <host> sudo nmap -sU -p 12345 <host> nc -zv <host> 12345
Block it in the firewall
sudo ufw deny 12345/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 12345" -Direction Inbound -LocalPort 12345 -Protocol TCP -Action Block # Windows
What is port 12345 used for?
Port 12345 is assigned by IANA to italk (Italk Chat System).
Is port 12345 TCP or UDP?
Port 12345 is registered for TCP and UDP.
Is it safe to open port 12345?
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 12345 is open?
On Linux run "ss -ltnup 'sport = :12345'", on macOS "lsof -nP -i :12345", and on Windows "netstat -ano | findstr :12345" to see the local process. From another machine, "nmap -p 12345 <host>" shows whether it is reachable.