2018-05-22 UTC
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petermolnar 1. domain. A domain name is an entry that points to an IP address. Dynamic DNS providers like no-ip allows residential clients, who's internet facing IP address is not fixed - meaning it can change when you restart your connection to the provider - to have a subdomain pointed at them, so xyz.no-ip.com will always point at the user who registers with that, rather than an IP that can shift from one user to another.