Ever wonder what network activity is happening on your machine? Use netstat.
The most useful command line options:
- -a = show all network access
 - -b = shows the process, or on windows the process id that is using the network (the process id can be matched up to a process via the task manager)
 - -n = don’t do a dns lookup
 
You can obviously chain this command together with grep:
- netstat -anb | grep 80