Which DNS record type maps an IPv6 address?

• A. A
• B. AAAA
• C. MX
• D. NS

Answer: (B)

In DNS, mapping a domain name to its network address uses specific record types. For IPv6 addresses, the record type is AAAA (Quad-A). This record stores the 128-bit IPv6 address associated with the hostname, enabling the name to resolve to an IPv6 address. By contrast, A records map hostnames to IPv4 addresses, while MX records designate mail servers and NS records indicate name servers, neither of which provide an address for general host resolution. So, AAAA is the record that maps a hostname to an IPv6 address.