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TCP/IP Subnetting Cheat Sheet

This is just a little cheatsheet for performing some quick calculations for making subnets.

Bitmask Mask Blocks Nets Hosts
0000 0000 000 256 1 254
1000 0000 128* 128 2* 126
1100 0000 192 64 2 62
1110 0000 224 32 6 30
1111 0000 240 16 14 14
1111 1000 248 8 30 6
1111 1100 252 4 62 2
1111 1110 254 2 126 X
1111 1111 255 1 254 X

* 128 Mask valid for Microsoft and CIDR only X valid in Class B, CIDR, or Supernetting only

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Posted: 2007-05-31
By: FortyPoundHead
Viewed: 2,756 times

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