NetChecker is a free command line software that can check  and fix problems with internet connectivity in your computer. NetChecker can detect the most common connectivity problems of wired and wireless broadband internet,which default troubleshooter in windows can not solve.First of all, NetChecker will identify the exact problem of the computer accessing the Internet connection, and then if possible it will  try to resolve the problem automatically.NetChecker uses default Windows shell tool installed on Windows operating system. NetChecker  is really not use a third party tool, therefore, the software is fast, secure, and reliable and even more fascinating . NetChecker currently able to test and fix the problem of  most types of cable, broadband connection and wireless connections as well. But it does not support dial-up connection and mobile internet. NetChecker designed and tested to run on Windows XP, Windows Vista, Windows 7 and Windows 8.NetChecker can not run on earlier versions of Windows.