168.1.120/30 192.168.1.120/29 192.168.1.124/30 192.168.1.0/24 192.168.1.128/30 192.168.1.128/29 192.168.1.132/30 192.168.1.128/28 192.168.1.136/30 192.168.1.136/29 192.168.1.140/30 192.168.1.128/27 192.168.1.144/30 192.168.1.144/29 192.168.1.148/30 192.168.1.144/28 192.168.1.152/30 192.168.1.152/29 192.168.1.156/30 192.168.1.128/26 192.168.1.160/30 192.168.1.160/29 192.168.1.164/30 192.168.1.160/28 192.168.1.168/30 192.168.1.168/29 192.168.1.172/30 192.168.1.160/27 192.168.1.176/30 192.168.1.176/29 192.168.1.180/30 192.168.1.176/28 192.168.1.184/30 192.168.1.184/29 192.168.1.188/30 192.168.1.128/25 192.168.1.192/30 192.168.1.192/29 192.168.1.196/30 192.168.1.192/28 192.168.1.200/30 192.168.1.200/29 192.168.1.204/30 192.168.1.192/27 192.168.1.208/30 192.168.1.208/29 192.168.1.212/30 192.168.1.208/28 192.168.1.216/30 192.168.1.216/29 192.168.1.220/30 192.168.1.192/26 192.168.1.224/30 192.168.1.224/29 192.168.1.228/30 192.168.1.224/28 192.168.1.232/30 192.168.1.232/29 192.168.1.236/30 192.168.1.224/27 192.168.1.240/30 192.168.1.240/29 192.168.1.244/30 192.168.1.240/28 192.168.1.248/30 192.168.1.248/29 192.168.1.252/30 Figure 36-2. Classful subnets of a /24 network Classful/27 Invalid 192.168.1.0/30 192.168.1.0/30 Each block is the With VLSM, blocks can 192.168.1.4/30 192.168.1.0/27 be of varying sizes. This 192.168.1.8/30 same size. In this block is 8 subnets of 4 case, 32 hosts. 192.168.1.24/30 hosts each (/30). 192.168.1.24/30 192.168.1.28/30 192.168.1.32/29 192.168.1.32/29 192.168.1.32/27 192.168.1.40/29 192.168.1.40/29 192.168.1.48/29 192.168.1.48/29 192.168.1.56/29 192.168.1.56/29 192.168.1.64/27 192.168.1.64/27 This single block is 32 192.168.1.64/27 hosts (/27). 192.168.1.96/28 192.168.1.96/28 192.168.1.96/27 192.168.1.112/28 192.168.1.112/28 192.168.1.128/27 192.168.1.128/26 192.168.1.128/26 192.168.1.160/27 This block is invalid. Networks must still 192.168.1.192/29 follow the rules of binary, 192.168.1.192/29 192.168.1.200/29 and as such must begin 192.168.1.192/27 on classful subnet 192.168.1.200/28 192.1