Block pop-up ads

This tip will help you block access to certain Web sites by adding loopback entries to your DNS or "hosts" file.

This tip was submitted to the SearchWin2000.com Tip Exchange by member Carlos Montgomery. Let other users know how useful it is by rating the tip below.


If you control your DNS internally, you can block Web sites to which your company does not allow access by adding loopback entries to your DNS or "hosts" file.

In your "hosts" file on your PCs, add lines similar to the following -- depending on what you want to block:

  • 127.0.0.1 ads.doubleclick.net
  • 127.0.0.1 ads.x10.com

You could also use an internal Web server address that has been set up to display a company warning about accessing inappropriate material while at work or add an equivalent entry in your DNS files. Any sites that open a bewildering array of pop-ups when you try to exit them can also be blocked in this manner.

This was first published in July 2002

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