def list(self, subid, params=None):
        ''' /v1/server/list_ipv4
        GET - account
        List the IPv4 information of a virtual machine. IP information is only
        available for virtual machines in the "active" state.

        Link: https://www.vultr.com/api/#server_list_ipv4
        '''
        params = update_params(params, {'SUBID': subid})
        return self.request('/v1/server/list_ipv4', params, 'GET')
/v1/server/list_ipv4
        GET - account
        List the IPv4 information of a virtual machine. IP information is only
        available for virtual machines in the "active" state.

        Link: https://www.vultr.com/api/#server_list_ipv4