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What is an A/AAAA record?

An A and AAAA record are actually primary DNS records.  They associate a domain name with a specific IP address, so that when a user types in a web address, such as "www.rackspace.com" their browser knows where to go for the actual website.

The difference between A and AAAA is this: A is IPv4 and AAAA is the current IPv6 record.  Beyond that, there is no difference.  Later on, IPv6 records will be changed to A6 records.