Address allocation and acquisition method and device

Disclosed are an address allocation and acquisition method and device. The method comprises: receiving a network access request; according to the network access request, allocating a host identity identification or a host location identification to a node requesting access; both the host identity identification and the host location identification are IPv6 addresses, the IPv6 address serving as the host identity identification comprises a first address type symbol, the IPv6 address serving as the host location identification comprises a second address type symbol, and the first address type symbol and the second address type symbol have different spaces for values thereof; sending to an assigned domain mapping server of the node the host identity identification or the host location identification allocated to the node, such that the assigned domain mapping server of the node maintains a corresponding relationship between the host identity identification and the host location identification of the node.