Linux - Test open ports with out telenet, Methods to test open ports

Test open ports with out telenet

There are different methods to test open port of your server without telnet. But a normal used method is telnet.

netcat is a tool which is used to test or connect to different ports of a server

 # nc 127.0.0.1 123 < /dev/null; echo $?

Will output 0 if port 123 is open, and 1 if it's closed

Test Single port using netcat

 # nc -zv 127.0.0.1 80

Multiple ports using netcat

 # nc -zv 127.0.0.1 22 80 8080

Range of ports using netcat

 # nc -zv 127.0.0.1 20-30

Test open ports using curl

 # curl http://127.0.0.1:5472

Test open port using lsof

 # lsof -i :80

 # lsof -i :8233

Test open port using netstat

 # netstat -a | grep -i 'LISTEN'

Test open port using telnet

 # telnet servername port

 # telnet myserver 8033
   
   Trying server...
   Connected to server.
   Escape character is '^]'

Also, nmap which is used to scan ports, but it is supposed not to be used.

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