1. Subnets possible=2^6=64
Number of hosts per subnet=2^10-2
2. let the subnet count start from 0, i.e., subnet0, subnet 1.....
subnet 1 range: 135.50.00000100.00000000 to 135.50.00000111.11111111
so ip of first host in subnet 1: 135.50.00000100.00000001=135.50.4.1
subnet 4 range: 135.50.00010100.00000000 to 135.50.00010111.11111111
so ip of first host in subnet 1: 135.50.00010100.00000001=135.50.20.1
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reference-
n bits for subnet id, this implies 2^n subnets possible
n bits for host id, this implies 2^n-2 hosts per subnet possible(1 ip for subnet id and 1 ip for dba excluded)