: Can a multivalued A record serve as several A records? The host (Squarespace) for one of my domains recommends having 4 A records (which they say would have helped in the recent DDoS attack
The host (Squarespace) for one of my domains recommends having 4 A records (which they say would have helped in the recent DDoS attack on my registrar) but the tools I have access to for managing my records allow for only a single A record. However it appears that I can enter multiple values in a single A record.
Will a multi-valued A record serve as several A records with single values? Are these equivalent configurations?
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You will find that:
A records only support one value per each entry, see: RFC 1035.
AAAA records only support one value per each entry, see RFC 3596.
Both A and AAAA records support multiple entries.
The issue you have is due to the fact that the name servers and the control panel it uses to config your settings is purposely restricted for one or more reasons, but most often because some registrars, the more expensive type and the ones who like to think they are offering a better service, charge extra for Premium DNS management.
So, without knowing more about the reason you can't add more records your options are:
Registrar Related Issue
Contact your current registrar and ask them to manually add the records.
Contact your current registrar and upgrade to Premium DNS.
Contact your current registrar and migrate away from them to a better registrar.
Hosting Related Issue (DNS Records managed by your hosting provider, change of NS records)
Ask the administrators to manually add the records on your behalf.
Change name servers and use something like RackSpace DNS (It's free).
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