An alternate report type was used in early DNS implementations for IPv6, made to facilitate network renumbering, the A6 records for the forward lookup and many other improvements such as little bit-string labels and DNAME documents. I just made some more observations about this and they match pretty much with https://fastleanpro87401.bloggazza.com/25863988/how-whats-my-ipv6-can-save-you-time-stress-and-money