- Close the port if nothing on the host needs it.
- Identify the process that listens on it (commands below) before opening it in a firewall.
- Expose a service only to the networks that use it.
Port 30400: GroundStar RealTime System
Port 30400 is assigned by IANA to gs-realtime (GroundStar RealTime System).
30400
How gs-realtime works
Other servicesThe client sends a request to port 30400 and the gs-realtime service answers.
- Transport
- TCP
- 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
- Other services
Is port 30400 dangerous?
We have no specific security note for port 30400. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 30400
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| gs-realtime | 30400 | TCP | GroundStar RealTime System | - | 2017-12-13 |
| - | 30400 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 30400, and is it reachable?
Linux
sudo ss -ltnup 'sport = :30400' # process listening on 30400
sudo lsof -nP -i :30400macOS
sudo lsof -nP -i :30400
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 30400 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 30400 netstat -ano | findstr :30400
From another machine
nmap -p 30400 -sV <host> nc -zv <host> 30400
Block it in the firewall
sudo ufw deny 30400/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 30400" -Direction Inbound -LocalPort 30400 -Protocol TCP -Action Block # Windows
What is port 30400 used for?
Port 30400 is assigned by IANA to gs-realtime (GroundStar RealTime System).
Is port 30400 TCP or UDP?
Port 30400 is registered for TCP.
Is it safe to open port 30400?
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. Close the port if nothing on the host needs it.
How do I check if port 30400 is open?
On Linux run "ss -ltnup 'sport = :30400'", on macOS "lsof -nP -i :30400", and on Windows "netstat -ano | findstr :30400" to see the local process. From another machine, "nmap -p 30400 <host>" shows whether it is reachable.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp