Appendix A states: "IPv4-Compatible IPv6 address and IPv4-Mapped IPv6 address are defined that carry an IPv4 address in the low-order 32 bits of the address. These addresses have special representation that combine hexadecimal and decimal notations. IPv4-Compatible IPv6 address is deprecated. Although the use of IPv4-Mapped IPv6 address is not recommended due to security and portability problems, the text representation method noted in this document should be applied for the hexadecimal part."
The recommended use of mapped addresses is debatable and this document could take a more neutral position. Also do you really think it's necessary to even mention something that's been deprecated for a while now? I'd completely omit mention of the deprecated addresses:
Appendix A. IPv6 Addresses with Embedded IPv4 Addresses IPv4-Mapped IPv6 addresses carry an IPv4 address in the low-order 32 bits of the address. These addresses have special representation that combine hexadecimal and decimal notations. The text representation method noted in this document should be applied for the hexadecimal part of IPv4-Mapped IPv6 addresses. Antonio Querubin whois: AQ7-ARIN -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
