The invention discloses an address allocation method and equipment. The address allocation method includes that a BRAS records a virtual domain and the corresponding relationship between the virtual domain and one or more real domains; when the BRAS receives an address application message from terminal equipment, the BRAS confirms the virtual domain corresponding to the terminal equipment and selects one real domain from the real domains corresponding to the virtual domain; the BRAS confirms an IP address pool corresponding to the real domain, selects one unused IP address from the IP address pool and allocates the IP address to the terminal equipment. According to the embodiment, the number of IP addresses capable of being used can be extended without correcting any configuration on an AAA server and influencing the currently using users, and the phenomenon that the terminal equipment cannot obtain an IP address is avoided.