Googlemail or whatever *.1e100.net

Question

Google

Good afternoon.
Today, after the speed of my favorite stream dropped to some monstrously low limits, I decided to ping something.
When pinging mail.google.com, I was addressed to ber01s02-in-f18.1e100.net (209.85.149.18)
Surprised, I decided to check what kind of address this was and found that this address was in the blacklist. Frightened, I rushed to check the rest of the Google services, but they seemed to be responding from the correct servers. Deciding that the provider's dns is giving me a mess, I called technical support and told what I think. They checked for 5 minutes, but they said that everything was in order. Now I climbed into a vpn (moreover, from Amazon) and when I ping the same mail.google.com I get iad04s01-in-f17.1e100.net (72.14.204.17). When I try to find what kind of 1e100 this is, I seem to see the inscriptions of the Corporation of Good.
Who and what to believe?
PS And by the way, for vpn the speed is clearly higher.

Answer 1

www.google.com/support/bin/answer.py?hl=en&answer=174717