You can use the Azure PowerShell module inside the VM to check for the ILPIP like this:
#Get the associated Public IP Name for a virtual machine
Get-AzureVM -ServiceName "YourCloudServiceDomain" -Name "YourVMName" | Get-AzurePublicIP
or
#Get the assigned Public IP Address for a virtual machine
$instance = Get-AzureVM -ServiceName "YourCloudServiceDomain" -Name "YourVMName"
$instance.PublicIPAddress
If you prefer a REST Api you can check the List Reserved IP Address call https://msdn.microsoft.com/library/azure/dn722418.aspx/