With Cox, that works in Phoenix, Tuscon, and Vegas. Most other Cox areas, that doesn't work.
With Comcast, RoadRunner, OOL, Brightcove, Charter, and Buckeye (among others) - the IP does not change by modem. It only changes by the MAC of the device connected to the modem. Change the device MAC, get an IP. Change the modem, still the same IP.
It does vary from area to area. About 1% of cable customers would get a new IP by changing modem. 99% will have the same IP no matter what modem they use.
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