SoCal Delicious

JANUARY 15, 2010

This article is a practical guide designed to help webmasters who already know what they want to block. How to Identify the Bot You Want to Block Before you can block a bot, you will need to know at least one of two things: the IP address where the bot is coming from or the"User Agent string" that the bot is using. Be careful though.

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SoCal Delicious

JANUARY 15, 2010

Please note that my design suggestions ain’t black nor white. While handling bots, you should detect search engine crawlers, too: /* lookup your crawler IP database to populate $isCrawler; then, if the IP wasnt identified as search engine crawler: */ if ($isCrawler !== from the IP address range 65.52.0.0

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SEO IP PHP Blogging 37

SoCal Delicious

JANUARY 15, 2010

ThingFetcher sometimes requests a (shortened) URI 30 times per second, from different IPs. A method to verify the bot All IP addresses used by a bot should resolve to server names having a unique pattern. For example Googlebot comes only from servers named "crawl" + "-" + replace($IP, ".", "-") + ".googlebot.com" Sad but true.

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