- 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 1718: H.323 Multicast Gatekeeper Discover
Port 1718 is assigned by IANA to h323gatedisc (H.323 Multicast Gatekeeper Discover).
1718
How h323gatedisc works
Voice & chatPort 1718 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 1718 dangerous?
We have no specific security note for port 1718. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 1718
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| h323gatedisc | 1718 | TCP, UDP | H.323 Multicast Gatekeeper Discover | - | 2013-01-31 |
// source: IANA service name and port number registry
Which program uses port 1718, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1718' # process listening on 1718
sudo lsof -nP -i :1718macOS
sudo lsof -nP -i :1718
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1718 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1718 netstat -ano | findstr :1718
From another machine
nmap -p 1718 -sV <host> sudo nmap -sU -p 1718 <host> nc -zv <host> 1718
Block it in the firewall
sudo ufw deny 1718/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1718" -Direction Inbound -LocalPort 1718 -Protocol TCP -Action Block # Windows
What is port 1718 used for?
Port 1718 is assigned by IANA to h323gatedisc (H.323 Multicast Gatekeeper Discover).
Is port 1718 TCP or UDP?
Port 1718 is registered for TCP and UDP.
Is it safe to open port 1718?
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 1718 is open?
On Linux run "ss -ltnup 'sport = :1718'", on macOS "lsof -nP -i :1718", and on Windows "netstat -ano | findstr :1718" to see the local process. From another machine, "nmap -p 1718 <host>" shows whether it is reachable.