In the basic Proxy Mobile IPv6 (PMIPv6) specification@ a Mobile Node (MN) is assigned with a Home Network Prefix (HNP) during its initial attachment@ and the MN configures its Home Address (HoA) with the HNP. During the movement of the MN@ the HNP remains unchanged to keep ongoing communications associated with the HoA. However@ the current PMIPv6 specification does not specify related operations when HNP renumbering has occurred (e.g.@ due to change of service provider or site topology@ etc.). In this document@ a solution to support HNP renumbering is proposed@ as an optional extension of the PMIPv6 specification.