My ISP lets me have an IP for as long as my ONT is online. If it reboots, I'm likely to get a new address if it's offline long enough.

So my ONT is on a UPS. We only get power outages once or twice a year, but I havent had my IP change in two years now.

And yeah, when it changes I just go into my DNS and update the records. It's like a five minute job. I could probably automate it if I cared to figure out Hover's API. It'd take probably a dozen resets to get a return on that time investment so I just haven't bothered.

I'm not sure if this is a regular feature of fiber networks or just that my ISP is nice. So much better than DOCSIS when I'd randomly get booted off and given a new address.