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UCYBERS's Subnetting Sheet
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Subnet x.0.0.0
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CIDR/1/2/3/4/5/6/7/8
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Hosts 2,147,483,648 1,073,741,824 536,870,912 268,435,456 134,217,728 67,108,864 33,554,432 16,777,216
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Subnet 255.x.0.0
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CIDR/9/10/11/12/13/14/15/16
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Hosts 8,388,608 4,194,304 2,097,152 1,048,576 524,288 262,144 131,072 65,536
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Subnet 255.255.x.0
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CIDR/17/18/19/20/21/22/23/24
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Hosts 32,768 16,384 8,192 4,096 2,048 1,024 512 256
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Subnet 255.255.255.x
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CIDR/25/26/27/28/29/30/31/32
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Hosts 128 64 32 16 8 4 2 1
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Subnet Mask (Replace x)
128192224240248252254255
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Notes:
*Hosts double each increment of a CIDR
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*Always subtract 2 from host total:
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Network ID - First Address
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Broadcast - Last Address
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