For DNS to work in IPv6, the changes that occurred are defined in RFC 3596, where domain names are mapped to IPv6 addresses by AAAA records, where they are known as quadruple DNS records, what is done is to divide the space of names in a hierarchical manner for each hexadecimal digit of an IPv6 address. Just as in IPv4, each host has two DNS records, one direct and one reverse resolution that was added as a PTR record to the ip6.arpa domain.

DNS (Domain Name System) works with both IPv4 and IPv6. The main difference is not in the DNS system itself, but in the type of records that are used to point to an IP address. Here's a brief breakdown:

A and AAAA records

• A-records: They are used in DNS to map host names to IPv4 addresses. For example, when you enter a domain name into your browser, the DNS system uses an A record to translate that name to the web server's IPv4 address number.
• AAAA Records (quad-A): They work similarly to A records, but are designed to map hostnames to IPv6 addresses. This means that when a device requests the address of a server that is configured with IPv6, the DNS system will look up an AAAA record to obtain the corresponding IPv6 address.

How DNS works in IPv6

• DNS servers can operate on IPv4, IPv6, or both networks simultaneously. The DNS infrastructure is independent of the Internet Protocol versions that are used for the IP addresses of the hosts being queried.
• When a device configured to use IPv6 requests a domain address, it will attempt to obtain an AAAA record from the DNS system. If the domain has an AAAA record associated with it, the IPv6 address will be returned. If it only has an A record, then the device may need to use transition or support mechanisms to communicate with the IPv4 address, depending on its network configuration.

Compatibility and Transition

• To facilitate the transition from IPv4 to IPv6 and ensure compatibility, there are several strategies and technologies, such as dual-stack, where devices and servers are configured to handle both IPv4 and IPv6 addresses simultaneously.
• In DNS terms, this means that a server can contain A and AAAA records for the same domain, thus allowing devices using IPv4 or IPv6 to resolve suitable IP addresses to connect to the server.

In summary, the DNS system works with both versions of IP (IPv4 and IPv6) by using different types of records (A for IPv4 and AAAA for IPv6) to resolve domain names to their corresponding IP addresses.

The global DNS infrastructure has been updated to support IPv6, ensuring that devices on IPv6 networks can resolve addresses and access resources on the Internet efficiently.