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Are they that unlikely? My IPv4 is stable for months/years, despite being "dynamic". I don't even run a dynamic DNS client, since it's so rare that it actually changes.

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It really depends on the ISP. Back when we were still using A1 (what used to be the Austrian telecom basically), we would receive a new IP address every time we reconnected. Now after switching to Liwest (a very local provider, only serves this city and some small towns around it) our IP is for all intents and purposes static, even though it wasn't advertised as such.

>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.

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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