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I don't bother with dynamic DNS- my home IP has never changed, and if it does change- I don't host anything where some downtime would matter much.

But this site has been recommended to me before- https://freedns.afraid.org/

My concern with the IP changing is if I was on vacation and my IP changes, I'd have no clue how to get back to it.

I use a dynamic DNS service for safety, but my IP address has literally never changed yet.

What makes the (lack of a) dynamic DNS a safety issue?

By "safety" I mean the ability to reach my machines even if the external IP address changes.