IP is only per computer if you have multiple IPs provided from your ISP and you have your network setup to reflect those settings. Most ISPs will only allow you to have 1 IP address and that is given to your router. Your router then translates that IP address and allows all of the PCs on your network to appear as that one IP to everything else on the internet. This is called Network Address Translation (NAT) and is very common on almost all home networks these days. It also helps protect your PCs from full direct access to the internet, which keeps hackers out.
So, VZ/TZ sees the IP of your router only and any computers behind that router show up as coming from the same IP. So you can't have more than 2 connections per house-hold.
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