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How to check whether a request really comes from GPTBot, Googlebot or a research scanner, and how to put IP geolocation to work in your code.
Automatically redirecting by IP looks simple, and it is one of the easiest ways to make your other country sites invisible in search. Here is what Google recommends, a pattern that works for people and crawlers, and code for it.
IP geolocation is an estimate built from registry records, operator feeds and network measurements. It is usually right about the country and only approximate about the city. Knowing why helps you use it where it works and avoid it where it doesn't.
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