Mozilla/5.0

Google Proxy

[keyplyr]

UA: Mozilla/5.0
Protocol: HTTP/1.1
Robots.txt: No
Host: Google Proxy
66.249.64.0 - 66.249.95.255
66.249.64.0/19

Mozilla/5.0 has long been used by bots to sneak in under server restrictions.

[TorontoBoy]

I always block those. No human browser just has that UA. I do look at my request headers and they are always bots.