Netcat, or nc, is an excellent tool for linux. One thing it's great for is port scanning.
Let us say we want to scan for open ports from 1 to 1000, we can do that like so:
nc -n -z -w 1 192.168.1.2 1-1000
-n prevents DNS lookup. -z will prevent Netcat from receiving any data. -w 1 sets the timeout to 1 second.
You can also use -v to make it verbose, but this will obscure the visibility of successful attempts, which running it without shows.
An example output for the above command is:
Connection to 192.168.1.2 80 port [tcp/] succeeded!
Connection to 192.168.1.2 427 port [tcp/] succeeded!
Connection to 192.168.1.2 515 port [tcp/*] succeeded!
So useful!
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