http://who.is/whois has been crawled 23 times going all the way back to January 15, 2008.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ

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February 3, 2010

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February 9, 2010

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May 15, 2010

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May 26, 2010

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July 26, 2010

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Note

This calendar view maps the number of times http://who.is/whois was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.