- 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 1259: Open Network Library Voice
Port 1259 is assigned by IANA to opennl-voice (Open Network Library Voice).
1259
How opennl-voice works
Voice & chatPort 1259 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 1259 dangerous?
We have no specific security note for port 1259. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 1259
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| opennl-voice | 1259 | TCP, UDP | Open Network Library Voice | - | - |
// source: IANA service name and port number registry
Which program uses port 1259, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1259' # process listening on 1259
sudo lsof -nP -i :1259macOS
sudo lsof -nP -i :1259
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1259 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1259 netstat -ano | findstr :1259
From another machine
nmap -p 1259 -sV <host> sudo nmap -sU -p 1259 <host> nc -zv <host> 1259
Block it in the firewall
sudo ufw deny 1259/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1259" -Direction Inbound -LocalPort 1259 -Protocol TCP -Action Block # Windows
What is port 1259 used for?
Port 1259 is assigned by IANA to opennl-voice (Open Network Library Voice).
Is port 1259 TCP or UDP?
Port 1259 is registered for TCP and UDP.
Is it safe to open port 1259?
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 1259 is open?
On Linux run "ss -ltnup 'sport = :1259'", on macOS "lsof -nP -i :1259", and on Windows "netstat -ano | findstr :1259" to see the local process. From another machine, "nmap -p 1259 <host>" shows whether it is reachable.