How to determine the current subnet

Is it possible to determine which AD subnet the current session belongs to?

I'm looking for something similar to the "SiteName" property of 
"ADSystemInfo" COM object:
    Set objADSysInfo = CreateObject("ADSystemInfo")
    WScript.Echo "Current site name: " & objADSysInfo.SiteName

But I'm looking for the name or DN of the current subnet that was used to 
determine the connection was under that site.

(A subnet name like "10.10.10.10/24" or 
LDAP://CN=10.10.10.10/24,CN=Subnets,CN=Sites,CN=Configuration,DC=domain,DC=com)