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But if you want to be able to be found on the Internet, you need either a static address (which ISPs are reluctant to provide, or will do so only at an additional cost), or you need a way to update your domain's IP address dynamically.
To solve the problem, DNS was extended with new protocols so that host names could be resolved with changing IP addresses.
Here's how it works: When you type a name, such as into your browser's address bar, your computer sends a DNS lookup request to your local DNS server (typically hosted by your ISP).
During its normal course of operation, the local server caches entries in resource records.
Pricing for DDNS services for custom domains (your own domain name) is the same at all three providers, at .95 per year.
A dynamic IP address changes every so often, as compared to a static IP address, which never changes. When I check their web site, it is displaying the correct external IP address for my router. I have tried to set up an account at but I don't think it is working properly.So if there's a current cached entry for the local DNS server returns the corresponding IP address (.186) to your computer, and your browser connects to that address.If there's no current entry, the DNS server contacts a root server for the top-level domain (such as .com, .org, or .net).
Normally, a changing IP address does not cause any problem until you try to connect to a local device from outside of your home network.