http port number

port 80 is default HTTP port number.
When we are typing URL in browser like http://www.google.com , browser application
connecting to server www.google.com port 80.
It's possible to specify other port , in this case URL will be like
http://www.myserver.com:8080/ .
All major web servers has default port 80 as service port.
However if this port is occupied by another application , web server may start on different port.

To check if port 80 is occupied on your computer or to verify if webserver is running.
Download and run porttester, and enter in server textbox localhost and 80 in port textbox.
Then click on Test button.
If server is running on HTTP port you will see Port is not available.