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Pardon my ignorance, but this is something I've always wondered.

You can setup fail over DNS servers, just list different DNS servers, possibly from different companies, with your registrar.

Is the registrar a unavoidable single-point of failure? Your multiple name servers are listed with your one-and-only-one registrar, no matter what?

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This wasn’t a technical problem with the domain. The DNS changed because op’s registrar failed to renew the domain. The website was working intermittently because of propagation, not a server issue.

Problems like this are why registrars renew domains a month before they expire. The way to avoid these issues is to check to see if your domain renews on time. If your registrar fails to renew it, you have ample time to transfer it to another registrar.

I understand it wasn't a technical problem.

I was wondering if it was possible to have a backup listing of your nameservers in some fashion?

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