UA: IABot: Checking if link from Wikipedia is broken and needs removal - See https://meta.wikimedia.org/wiki/InternetArchiveBot/FAQ_for_sysadmins
Host: Wikimedia Foundation Inc.
126.96.36.199 - 188.8.131.52
This same bot now scrapes for the Internet Archive (IA.) Some site owners feel having their digital property (their entire web site) taken, stripped of ads & affiliate links, put on the IA and made public violates their rights and infringes copyright.
Clever, it appears they now require IA access in order to retain your Wikipedia citation and back-link.