Which record type is used for IPv6 addresses in DNS?

The correct choice for the record type used for IPv6 addresses in DNS is AAAA records. In the Domain Name System (DNS), A records are designated for IPv4 addresses, while AAAA records specifically serve to map hostnames to IPv6 addresses. This distinction is important as IPv4 and IPv6 are different protocols, and each requires a specific type of record in DNS to ensure proper resolution.

AAAA records allow websites and services using the newer IPv6 addressing scheme to be accessed over the internet. When a user enters a domain name into a browser, the DNS resolver queries the DNS servers for the corresponding AAAA record, enabling it to find the IPv6 address that is associated with that domain.

MX records are used for mail exchange resources and define the mail servers responsible for receiving email on behalf of a domain, while TXT records are utilized to hold arbitrary text data, often for verification purposes, such as SPF records for email authentication. These other record types do not pertain to the resolution of IPv6 addresses, which is why they are not the correct answer.