General
How does the router know which device to send packets to?
https://superuser.com/questions/524241/how-does-the-router-know-which-device-to-send-packets-toHost
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/HostSingle IP with multiple DNS
https://serverfault.com/questions/44527/single-ip-with-multiple-dnsVirtual hosting - Wikipedia
https://en.wikipedia.org/wiki/Virtual_hosting#Name-basedDedicated IP hosting - benefits of using a static over shared IP address.
http://www.buildwebsite4u.com/articles/dedicated-ip.shtmlHow does shared hosting work?
https://superuser.com/questions/250518/how-does-shared-hosting-workDo two computers connected on the same Wi-Fi have the same IP address?
https://superuser.com/questions/801105/do-two-computers-connected-on-the-same-wi-fi-have-the-same-ip-address