The Search Engine Blog

Don’t want your ads appearing on a certain site? You can now exclude the IP address from displaying your ads. This is a welcomed addition as it will exclude all sites hosted on that one address saving you grief over figuring out all the possible domain names. Warning….this is also a bad thing as some machines host a number of domain names which may not be related. You could be blocking sites you don’t want to block. Use only when it’s imperative to block.

What is IP address exclusion? Google AdWords Help Center