POST /

Content-Type: application/x-www-form-urlencoded

Action=AssignPrivateIpAddresses&AllowReassignment=true&Ipv4Prefix.1=__Member__&Ipv4Prefix.2=__Member__&Ipv4PrefixCount=1&NetworkInterfaceId=__NetworkInterfaceId__&PrivateIpAddress.1=__Member__&PrivateIpAddress.2=__Member__&SecondaryPrivateIpAddressCount=1&Version=2016-11-15