10.0.0.0 - 10.255.255.255 172.16.0.0 - 172.31.255.255 192.168.0.0 - 192.168.255.255However some systems may do a reverse lookup on such IP addresses. In these cases the information has the potential for being queried on the Internet. If you are using one of these IP address ranges internally in your organization, you should make sure that you have configured the reverse lookup zones that correspond to the private IP address scheme that you are using.
For more information on the use of black hole servers take a look at:
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