12-16-2015
You can approach it from various angles:
a) 1-to-1 mapping is not strictly correct. It can be as many as you want to point your domains to a specific IP. For example, I have this public IP 8x.73.1.9 (all made up, course). And I registered 3 domains: mydomain.com, myotherdomain.net, mythirdsite.org. I can have them all pointed to the same IP. Assuming that I have setup web servers (or mail servers) to each and one of them, they can serve contents distincts from one another while sharing the same IP and users won't even notice that they are connected to 1 IP.
b) With regards to big companies, the IPs that you are connecting to are the ones closest to your location. So 2 people (who are geographical separated) both connecting to youtube.com are actually connecting to different IPs. That is made possible by CDNs, DNS etc. I think IPv6 has inherent support for it via anycast.
c) IPs used by big co's are mostly virtual. Meaning they are not actually tied to a single machine but rather to a group of machine. That provides huge bandwith, failover, loadbalancing etc.
Sorry for my English, I tried my best.
Last edited by mr_zeratul; 12-16-2015 at 03:07 PM..
Reason: typo
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