Your keyword strategy should make clear which “keyword groups” you focus on. It doesn’t have to be a long list of keywords (though it doesn’t hurt to have one). Your keyword strategy should be a definition of a group of keywords that you’re tackling. Every time you’re writing new content you can have a quick look at those groups and pick a new keyword that falls in line with the strategy.
Now the ad servers don’t create this table themselves, they license it from another ‎company like MaxMind or DigitalEnvoy, whose primary business is geolocation ‎data.   This is no enviable task; IP addresses themselves don’t necessarily have an ‎obvious pattern in the way they are assigned like a telephone area code would.  It’s ‎a bit like solving a mystery, and the geolocation companies use a variety of ‎methods to approach the problem.  ‎ /injects>