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What causes a DNS outage?

What exactly is a DNS outage?

A DNS outage, also known as DNS downtime, is a period of time when the DNS is not functioning correctly. This means that if you look up the domain name, you won’t see its IP address. Instead, users will make DNS requests in order to reach your domain. The DNS recursive server will request the domain’s authoritative nameserver, but it will receive an error message as a response.