WMI reference by Microsoft

http://msdn.microsoft.com/en-us/library/windows/desktop/aa394572%28v=vs.85%29.aspx

Win DNS - Delete PTR record with all capitals

As per:

http://www.jetmore.org/john/blog/2012/09/deleting-ptr-records-containing-upper-case-characters-in-microsoft-dns/

use the following command to delete PTR record for 10.10.10.1 for instance:

dnscmd 10.10.10.33 /RecordDelete 10.10.in-addr.arpa. 1.10 PTR