SubNet and Host Counts

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Prefix size Network mask Available
subnets
Usable hosts
per subnet
Total
usable hosts
/24 255.255.255.0 1 254 254
/25 255.255.255.128 2 126 252
/26 255.255.255.192 4 62 248
/27 255.255.255.224 8 30 240
/28 255.255.255.240 16 14 224
/29 255.255.255.248 32 6 192
/30 255.255.255.252 64 2 128
/31 255.255.255.254 128 * 256

*only applicable for point-to-point links

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