DNS guides
What goes wrong with DNS, why it matters and how to fix it.
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Do you need IPv6 records in your DNS?
AAAA records and IPv6 nameservers let IPv6-only networks reach you. Learn when to add them and the one mistake to avoid.
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Glue records explained
Glue records let resolvers find nameservers that live inside the domain they serve. Learn why they are needed and what breaks without them.
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How to enable DNSSEC without breaking your domain
DNSSEC protects your DNS answers from tampering, but a mistake can make your domain unreachable. Learn how it works and how to roll it out safely.
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SOA serial mismatch between nameservers
When your nameservers report different SOA serial numbers, some are serving stale DNS data. Learn what causes it and how to fix it.
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What is a lame delegation, and how do you fix it?
A lame delegation means a nameserver listed for your domain does not answer for it. Learn why it breaks DNS lookups and how to fix it.
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Why an MX record must not point to a CNAME
Pointing an MX record at a CNAME alias breaks mail delivery for some senders. Learn why the rule exists and how to fix it.
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Why you can't put a CNAME at the root of a domain
A CNAME at the domain apex conflicts with the SOA and NS records every zone needs, and can break email. Here is why and what to use instead.