Time for our third installment in the series. This time we look at the port scanner program.
3. The port scanner program
We’ll present a port scanner program that shows which ports are open on your computer, on someone else's computer, or on an Internet server. In order to achieve this, the program browses through a given range of ports, creates a socket and tries to connect to the server on each port.
In order to use this program, you have to pass 3 arguments to it: the server, the start port and the end port. This is the result of running the program with the arguments “www.google.com
This shows that, on www.google.com
, port 80 is open – it is the HTTP port waiting for connections.
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