8 192.168.1.48/28 192.168.1.0/25 192.168.1.64/28 192.168.1.64/28 192.168.1.64/28 192.168.1.64/28 192.168.1.64/28 192.168.1.64/28 192.168.1.64/28 192.168.1.80/28 192.168.1.80/28 192.168.1.80/28 192.168.1.80/28 192.168.1.80/28 192.168.1.80/28 192.168.1.80/28 192.168.1.96/28 192.168.1.96/28 192.168.1.96/28 192.168.1.96/27 192.168.1.96/27 192.168.1.96/27 192.168.1.96/27 192.168.1.112/28 192.168.1.112/28 192.168.1.112/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.128/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.144/28 192.168.1.160/28 192.168.1.160/28 192.168.1.160/28 192.168.1.160/28 192.168.1.160/27 192.168.1.160/27 192.168.1.160/27 192.168.1.160/27 192.168.1.176/28 192.168.1.176/28 192.168.1.176/28 192.168.1.176/28 192.168.1.192/28 192.168.1.192/28 192.168.1.192/28 192.168.1.192/28 192.168.1.192/28 192.168.1.192/28 192.168.1.208/28 192.168.1.208/28 192.168.1.208/28 192.168.1.208/28 192.168.1.208/28 192.168.1.208/28 192.168.1.192/26 192.168.1.192/26 192.168.1.224/28 192.168.1.224/28 192.168.1.224/27 192.168.1.224/27 192.168.1.224/27 192.168.1.244/27 192.168.1.240/28 192.168.1.240/28 Figure 36-9. Reverse binary IP subnet allocation The reverse binary method of IP subnet allocation is the most logical choice mathe- matically, but it can be the hardest to understand. Maintain proper documentation at all times to avoid confusion, regardless of the method you use. Chapter 36: IP Design IP Subnetting Made Easy IP subnetting seems to trip up quite a few people in the networking world. I've known experienced consultants who have worked in the industry for 15 years and still resort to subnet calculators. IP subnetting can be a daunting subject for those who are not familiar with it. The principles of subnetting are based on binary (and some mathematical) principles such as eXclusive-OR (XOR), which, for many people, are foreign concepts or aspects of coll