Welcome to WebmasterWorld Guest from 18.104.22.168
22.214.171.124 - - [09/Oct/2007:00:33:19 +0200] "GET /widgets.html HTTP/1.0" 200 15915 "http://example.com/other-widgets.html" "Mozilla/5.0 (compatible; archive.org_bot/1.13.1x +http://crawler.archive.org)"
IP resolves to archive.org, so I presume it's genuine and a more informative successor to the plain "ia_archiver".
The web page at [crawler.archive.org...] actually exists, but leaves me unsure as to what UA to put in robots.txt (archive.org_bot? heretrix?), though it's getting 403s now anyway.