There are two or three hubs between Europe and America, terminating the big under sea cables and a few internet backbones. It's not as if you had point connections to every IP. Rather, you go through one single IP to your provider in the general case. Somehow "decentral" lacks a proper graph theoretic definition.

By the way, the sun is decentralized, its center of gravity does not coincide with the galaxy's center of gravity!

Good comment anyway. I didn't even think of e-mail.