Win7 system query has opened the port number method

In the windows system, the port number is the exit of the system and the external communication communication, so the port in the system is extremely important, usually we will not all ports after installing the system Make changes, but if you have a lot of important files stored in your computer, and you are always facing the threat of hackers, then closing the port number that won't win can make the computer more secure. How do you know the port number that has been opened under win7 system? The following small series for everyone to query the win7 port number method, I hope to help you!
win7 system query has opened the port number method
1, open the run window, enter cmd click OK.

2, in the pop-up command prompt window, type netstat -na, then you can see the port number information.

we will be able to quickly view the port number has been opened by the above-mentioned operation is simple, in fact, is the way to view using the command line CMD, interested users may wish to try the next!