- 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 4455: PR Chat User
Port 4455 is assigned by IANA to prchat-user (PR Chat User).
4455
How prchat-user works
Voice & chatPort 4455 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 4455 dangerous?
We have no specific security note for port 4455. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 4455
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| prchat-user | 4455 | TCP, UDP | PR Chat User | - | - |
// source: IANA service name and port number registry
Which program uses port 4455, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4455' # process listening on 4455
sudo lsof -nP -i :4455macOS
sudo lsof -nP -i :4455
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4455 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4455 netstat -ano | findstr :4455
From another machine
nmap -p 4455 -sV <host> sudo nmap -sU -p 4455 <host> nc -zv <host> 4455
Block it in the firewall
sudo ufw deny 4455/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4455" -Direction Inbound -LocalPort 4455 -Protocol TCP -Action Block # Windows
What is port 4455 used for?
Port 4455 is assigned by IANA to prchat-user (PR Chat User).
Is port 4455 TCP or UDP?
Port 4455 is registered for TCP and UDP.
Is it safe to open port 4455?
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 4455 is open?
On Linux run "ss -ltnup 'sport = :4455'", on macOS "lsof -nP -i :4455", and on Windows "netstat -ano | findstr :4455" to see the local process. From another machine, "nmap -p 4455 <host>" shows whether it is reachable.