They share a tower in which they all broadcast together.
I get the same thing with 4 ISPs here in NY : TWC, Brighthouse, optimum and comcast.
If your Service provider is out of IPs (or they are all busy) they will branch off onto one of the neighboring stations IPs. Even with your same login info
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Cool, make sence, thanks, but now my ip's seem to be the same but only changes last 2 digits, before all the numbers where changing, will this stay on for long or is it short term. example ip's before is 74.24.15.66 now 72.200.400.** 72.200.400.** 72.200.400.** so only last 2 digits change, thats strange.