Strange UA and Activity from Google

has the gbot become sentient?

[uncle_bob]

Noticed a strange robot download a heap of pages and graphics (but no robots.txt) very fast this week. UA is

Mozilla/4.0 (compatible; MSIE 6.0; \t   Windows NT 5.1)

with a big space in the middle.

The IP address resolves to GOOGLE. Not quite sure what to make of it, as its neither acts like gbot, or a browser.

[volatilegx]

What's the IP address(es)?