- 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 4456: PR Chat Server
Port 4456 is assigned by IANA to prchat-server (PR Chat Server).
4456
How prchat-server works
Voice & chatPort 4456 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 4456 dangerous?
We have no specific security note for port 4456. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 4456
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| prchat-server | 4456 | TCP, UDP | PR Chat Server | - | - |
// source: IANA service name and port number registry
Which program uses port 4456, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4456' # process listening on 4456
sudo lsof -nP -i :4456macOS
sudo lsof -nP -i :4456
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4456 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4456 netstat -ano | findstr :4456
From another machine
nmap -p 4456 -sV <host> sudo nmap -sU -p 4456 <host> nc -zv <host> 4456
Block it in the firewall
sudo ufw deny 4456/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4456" -Direction Inbound -LocalPort 4456 -Protocol TCP -Action Block # Windows
What is port 4456 used for?
Port 4456 is assigned by IANA to prchat-server (PR Chat Server).
Is port 4456 TCP or UDP?
Port 4456 is registered for TCP and UDP.
Is it safe to open port 4456?
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 4456 is open?
On Linux run "ss -ltnup 'sport = :4456'", on macOS "lsof -nP -i :4456", and on Windows "netstat -ano | findstr :4456" to see the local process. From another machine, "nmap -p 4456 <host>" shows whether it is reachable.