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ANDING
and the last octet with 255.255.255.255
172.16.11. 01000010
255.255.255.11100000
------------------------------------
01000000>>>>>64
so the network is 172.16.11.64
the customized sunet mask is 255.255.255.224
so the 224 presente as 11100000 >>>> the last "1" equals to 32
so your range is 172.16.11.64 172.16.11.95 where 64 is the name of the network and 95 is the boradcast
and the valid host range is 64>>>94
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