http://ws.arin.net/whois/ has been crawled 545 times going all the way back to June 2, 2005.

A crawl can be a duplicate of the last one. It happens about 25% of the time across 420,000,000 websites. FAQ
Jan
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January 2, 2010

1 snapshot

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January 5, 2010

1 snapshot

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January 8, 2010

1 snapshot

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January 11, 2010

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January 13, 2010

2 snapshots

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January 17, 2010

1 snapshot

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January 18, 2010

1 snapshot

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January 21, 2010

1 snapshot

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January 24, 2010

1 snapshot

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January 28, 2010

1 snapshot

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Feb
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February 4, 2010

1 snapshot

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February 9, 2010

2 snapshots

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February 12, 2010

1 snapshot

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Mar
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March 24, 2010

2 snapshots

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March 25, 2010

2 snapshots

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March 28, 2010

1 snapshot

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Apr
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April 2, 2010

1 snapshot

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April 6, 2010

1 snapshot

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April 10, 2010

1 snapshot

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April 12, 2010

1 snapshot

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April 13, 2010

1 snapshot

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April 14, 2010

1 snapshot

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April 17, 2010

1 snapshot

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April 21, 2010

1 snapshot

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April 26, 2010

1 snapshot

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April 27, 2010

1 snapshot

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May

May 1, 2010

1 snapshot

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May 2, 2010

2 snapshots

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May 6, 2010

1 snapshot

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May 10, 2010

1 snapshot

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May 15, 2010

1 snapshot

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May 16, 2010

2 snapshots

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May 20, 2010

1 snapshot

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May 25, 2010

1 snapshot

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May 29, 2010

1 snapshot

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Jun
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June 3, 2010

1 snapshot

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June 6, 2010

1 snapshot

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June 11, 2010

1 snapshot

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June 12, 2010

1 snapshot

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June 15, 2010

1 snapshot

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June 19, 2010

1 snapshot

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June 20, 2010

1 snapshot

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June 24, 2010

1 snapshot

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June 28, 2010

1 snapshot

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Jul
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July 2, 2010

1 snapshot

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July 5, 2010

1 snapshot

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July 10, 2010

1 snapshot

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July 13, 2010

1 snapshot

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July 17, 2010

1 snapshot

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July 21, 2010

1 snapshot

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July 22, 2010

1 snapshot

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July 23, 2010

1 snapshot

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July 26, 2010

1 snapshot

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July 29, 2010

1 snapshot

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Aug

August 1, 2010

1 snapshot

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August 3, 2010

2 snapshots

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August 4, 2010

1 snapshot

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August 6, 2010

1 snapshot

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August 7, 2010

1 snapshot

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August 10, 2010

1 snapshot

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August 13, 2010

1 snapshot

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August 16, 2010

1 snapshot

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August 19, 2010

1 snapshot

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August 22, 2010

1 snapshot

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August 25, 2010

1 snapshot

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August 28, 2010

1 snapshot

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August 31, 2010

1 snapshot

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Sep
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September 21, 2010

1 snapshot

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September 22, 2010

1 snapshot

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September 29, 2010

1 snapshot

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Oct
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Nov
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Dec
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Note

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