A variety of alternative architectures have been proposed as the successor to IPv4. Many of these proposals have been published as RFCs and allocated IP version numbers by IANA. This status change formally moves RFC 1347, RFC 1819, and RFC 1621 to Historic status. As a part of this status change, IANA is directed to change IP version numbers 5, 8, and 9 to Reserved in the IP Version Numbers registry (http://www.iana.org/assignments/version-numbers/version-numbers.xhtml) and add this status-change document to their references. Additionally, version number 7 is to be marked Reserved and its reference updated to include RFC 6814.