Mobile IPv6 is the IETF proposition to support host mobility in the Internet. It provides routing optimization for packets sent to the mobile node at the expense of signaling messages that are periodically sent to the correspondent of the mobile node. We propose using XCAST, a multicast technique best designed for small groups, as a means to decrease this signaling. XCAST records the addresses of all the destinations in the packet itself. We evaluate the performance of our proposition against Mobile IPv6 route optimization. We obtain good results even when a very few routers, well located in the network, are able to process the extension.