172.16.0.0/16
172.16.0.0/20
255.255.11110000.00000000
SM-255.255.240.0
no ip ip=2^12 -2=4094
no of subnets=2^4=16
block size=256-240=16
0,16,32,48.....240
172.16.0.0/20
172.16.0.16/20
172.16.0.32/20
5 ips are reserved by aws---
192.168.20.0/24
192.168.20.0/25
255.255.255.10000000
255.255.255.128
no ip ip=2^7 -2=126
no of subnets=2^1=2
block size=256-128=128
192.168.20.0/25
192.168.20.128/25
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