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The way to check googlebot (in a way that will be resistant to expansion of Googlebot's IP ranges in the future) is to perform hostname lookup, with dns lookup as well to verify that the rDNS isn't a lie: https://developers.google.com/search/docs/advanced/crawling/...


Indeed, this was one of the things I considered (note I'm not OP), but then I didn't really want to rely on DNS. https://duckduckgo.com/?q=it's+always+DNS




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