An alternate file variety was used in early DNS implementations for IPv6, designed to facilitate network renumbering, the A6 data with the ahead lookup and numerous other improvements for example little bit-string labels and DNAME records. IPV4 and IPV6 are protocols used to build IP addresses. IPV4, the older of https://andyamxhp.isblog.net/a-review-of-whats-my-ipv4-43248174