- 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 529: IRC-SERV
Port 529 is assigned by IANA to irc-serv (IRC-SERV).
529
How irc-serv works
Voice & chatPort 529 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
- Well-known (0-1023)
- Category
- Voice & chat
Is port 529 dangerous?
We have no specific security note for port 529. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 529
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| irc-serv | 529 | TCP, UDP | IRC-SERV | - | - |
// source: IANA service name and port number registry
Which program uses port 529, and is it reachable?
Linux
sudo ss -ltnup 'sport = :529' # process listening on 529
sudo lsof -nP -i :529macOS
sudo lsof -nP -i :529
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 529 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 529 netstat -ano | findstr :529
From another machine
nmap -p 529 -sV <host> sudo nmap -sU -p 529 <host> nc -zv <host> 529
Block it in the firewall
sudo ufw deny 529/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 529" -Direction Inbound -LocalPort 529 -Protocol TCP -Action Block # Windows
What is port 529 used for?
Port 529 is assigned by IANA to irc-serv (IRC-SERV).
Is port 529 TCP or UDP?
Port 529 is registered for TCP and UDP.
Is it safe to open port 529?
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 529 is open?
On Linux run "ss -ltnup 'sport = :529'", on macOS "lsof -nP -i :529", and on Windows "netstat -ano | findstr :529" to see the local process. From another machine, "nmap -p 529 <host>" shows whether it is reachable.