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Webmasters: User Agent archive.org_bot is used for our wide crawl of the web. It is designed to respect robots.txt and META robots tags. Read more about Robots.txt. We try to crawl at a pace slow enough to not disrupt normal web activity. You can learn more in the Wayback Machine FAQs. If you notice archive.org_bot behaving badly, please contact us at bot.archive.org
Guess I forgot to mention the IP range was legit, assigned to Internet Archive. At one time their bots obeyed robots.txt, no longer it seems. I did email an abuse report to them. So far no answer.