POST /

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

Action=UnassignPrivateIpAddresses&Ipv4Prefix.1=__Member__&Ipv4Prefix.2=__Member__&NetworkInterfaceId=__NetworkInterfaceId__&PrivateIpAddress.1=__Member__&PrivateIpAddress.2=__Member__&Version=2016-11-15