DNS zones can contain multiple records, but some combinations are invalid or produce confusing behavior.
- Do not create a CNAME at a hostname that also needs other record data at the same name.
- Check both A and AAAA records when moving a website; clients may use either IPv4 or IPv6.
- Review all MX records and their priorities when changing mail providers.
- Remove stale verification or service records only after confirming they are no longer required.
- Be cautious with CAA records because an incorrect restriction can block SSL certificate issuance.
Before a major DNS change, record the existing zone so you can compare or restore required custom values.
