code: func (r Network_Subnet) GetUtilizedIpAddressCount() (resp uint, err error) {
  	err = r.Session.DoRequest("SoftLayer_Network_Subnet", "getUtilizedIpAddressCount", nil, &r.Options, &resp)
  	return
  }
docs: // Retrieve Provides the total number of utilized IP addresses on this subnet. The primary consumer of IP addresses are compute resources, which can consume more than one address. This value is only supported for primary subnet types.