A method for managing Internet protocol (IP) addresses in a network is provided. IP addresses are assigned to a plurality of virtual machines of servers in the network according to media access control (MAC) addresses of the virtual machines, and IP addresses are assigned to the servers according to MAC addresses of the servers. An active server and the virtual machines thereof respectively record the assigned IP addresses thereof in a recording unit. Then, the assigned IP addresses recorded by the recording unit are transmitted to a storage module in the network. Accordingly, the IP addresses assigned to the servers and the virtual machines could be handled properly in the network, and the servers and the virtual machines could be remotely controlled according to the IP addresses recorded in the storage module.