- 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 333: Texar Security Port
Port 333 is assigned by IANA to texar (Texar Security Port).
333
How texar works
Other servicesThe client sends a request to port 333 and the texar 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
- Well-known (0-1023)
- Category
- Other services
Is port 333 dangerous?
We have no specific security note for port 333. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 333
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| texar | 333 | TCP, UDP | Texar Security Port | - | - |
// source: IANA service name and port number registry
Which program uses port 333, and is it reachable?
Linux
sudo ss -ltnup 'sport = :333' # process listening on 333
sudo lsof -nP -i :333macOS
sudo lsof -nP -i :333
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 333 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 333 netstat -ano | findstr :333
From another machine
nmap -p 333 -sV <host> sudo nmap -sU -p 333 <host> nc -zv <host> 333
Block it in the firewall
sudo ufw deny 333/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 333" -Direction Inbound -LocalPort 333 -Protocol TCP -Action Block # Windows
What is port 333 used for?
Port 333 is assigned by IANA to texar (Texar Security Port).
Is port 333 TCP or UDP?
Port 333 is registered for TCP and UDP.
Is it safe to open port 333?
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 333 is open?
On Linux run "ss -ltnup 'sport = :333'", on macOS "lsof -nP -i :333", and on Windows "netstat -ano | findstr :333" to see the local process. From another machine, "nmap -p 333 <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