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There are "Dynamic DNS" services with a small daemon you install on your server that continuously update the DNS address so it remains online even if your ISP changes your IP on you.

https://account.dyn.com/

https://www.noip.com/remote-access

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btw this can be done with a 'proper' domain name too (e.g. at namecheap)

yep, I've done this before with a handy tool called ddclient, although there are other tools out there.

Isn't there a small time window during which your site is unaccessible due to DNS propagation time?

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