- 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 4000: Terabase
Port 4000 is assigned by IANA to terabase (Terabase).
4000
How terabase works
Other servicesThe client sends a request to port 4000 and the terabase service answers.
- 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
- Other services
Is port 4000 dangerous?
We have no specific security note for port 4000. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 4000
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| terabase | 4000 | TCP, UDP | Terabase | - | - |
// source: IANA service name and port number registry
Which program uses port 4000, and is it reachable?
Linux
sudo ss -ltnup 'sport = :4000' # process listening on 4000
sudo lsof -nP -i :4000macOS
sudo lsof -nP -i :4000
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4000 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 4000 netstat -ano | findstr :4000
From another machine
nmap -p 4000 -sV <host> sudo nmap -sU -p 4000 <host> nc -zv <host> 4000
Block it in the firewall
sudo ufw deny 4000/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 4000" -Direction Inbound -LocalPort 4000 -Protocol TCP -Action Block # Windows
What is port 4000 used for?
Port 4000 is assigned by IANA to terabase (Terabase).
Is port 4000 TCP or UDP?
Port 4000 is registered for TCP and UDP.
Is it safe to open port 4000?
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 4000 is open?
On Linux run "ss -ltnup 'sport = :4000'", on macOS "lsof -nP -i :4000", and on Windows "netstat -ano | findstr :4000" to see the local process. From another machine, "nmap -p 4000 <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