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Continue to ChatQuery : From John Conde's reply to a question of mine, see IP Lists. That site lists known IPs used by each search engine. Filtering by user-agent is not reliable because it can be faked extremely https://vmapp.org/query/83773/From-John-Conde-S-Reply-To-A-Question-Of-Mine-See-IP-Lists-That-Site-Lists-Known-IPs-Used-By-Each-Search-Engine-Filtering-By-User-Agent-Is-Not-Reliable-Because-It-Can-Be-Faked-Extremely/