DNS Extensions to Support IP Version 6
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S. Thomson, C. Huitema, V. Ksinant, M. Souissi · 2003-10
Abstract
RFC 3596 defines the AAAA resource record type for storing 128-bit IPv6 addresses in DNS, and the IP6.ARPA reverse lookup domain for IPv6 PTR records. A single AAAA record maps a hostname to one IPv6 address, analogous to the A record for IPv4. RFC 3596 obsoletes RFC 1886 and RFC 3152.
Why This RFC Matters
The AAAA record is the fundamental DNS mechanism enabling dual-stack and IPv6-only operation on the Internet. Every IPv6-accessible website, mail server, and application server requires an AAAA record for clients to resolve it. The naming convention (four times the bits of an A record, hence AAAA) has become a universal shorthand in networking discussions. As IPv6 adoption has grown past 40% of global traffic, AAAA record management has become a routine operational task.