Tuesday, October 13, 2015

Subnet Mask Information - Quick Reference Sheet


Address Bits Pref NetMask
1  0 /32 255.255.255.255
2  1 /31 255.255.255.254
4  2 /30 255.255.255.252
8  3 /29 255.255.255.248
16  4 /28 255.255.255.240
32  5 /27 255.255.255.224
64  6 /26 255.255.255.192
128  7 /25 255.255.255.128
256  8 /24 255.255.255
512  9 /23 255.255.254
1 K 10 /22 255.255.252
2 K 11 /21 255.255.248
4 K 12 /20 255.255.240
8 K 13 /19 255.255.224
16 K 14 /18 255.255.192
32 K 15 /17 255.255.128
64 K 16 /16 255.255
128 K 17 /15 255.254
256 K 18 /14 255.252
512 K 19 /13 255.248
1 M 20 /12 255.24
2 M 21 /11 255.224
4 M 22 /10 255.192
8 M 23 /9 255.128
16 M 24 /8 255
32 M 25 /7 254
64 M 26 /6 252
128 M 27 /5 248
256 M 28 /4 240
512 M 29 /3 224
1024 M 30 /2 192

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