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Probably old news to some, but I've had two Grub Crawlers in called "Mozilla/4.0 (compatible; grub-client-0.2.3; Crawl your stuff with [grub.org)"...]
IP's are 65.34.157.194 and 213.28.88.21 .
My list for Grub is
# Grub crawler.grub.org 65.34.157.194 206.30.142.100 213.28.88.2 216.183.203.7
Anybody have more?