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 34-9. 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. Proper documentation should be produced at all times to avoid confusion, regardless of the method used. 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. Chapter 34: IP Design 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 college courses long-since forgotten. There are really only two times when your average networking people need to know how subnet math truly works: when they study for their first networking certifica- tion (the CCNA), and when they study for their last (the CCIE). In fact, I don't rea