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>we would receive a new IP address every time we reconnected.

Some devices like cable modems rarely 'reconnect'. As long as your router and cable modem stay powered you can keep your IP for months.

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We used to turn them off as soon as we stopped using the internet (this was also before any of us had a smartphone). I think the ISP also cut the connection every 24 hours and changed the IP to prevent people from having a static IP "for free".

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