http://ikura.2ch.net/i4004/subback.html has been crawled 456 times going all the way back to 4月 19, 2012.
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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This calendar view maps the number of times http://ikura.2ch.net/i4004/subback.html was crawled by the Wayback Machine, not how many times the site was actually updated. More info in the FAQ.