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Tuesday, July 17, 2007

How to Subnet Your Network

Base Network Number/mask (for example, 38.242.251.0/24)
See KEY below for more examples
Desired #of segments You may only generate 2^n subnets.
Internet Router Model If router type is not listed, general instructions will be provided.
Which segment will the Internet router be on? 1 being the lowest segment
Internal Routing Method

KEY
Each octet, 8 ones, equals 255 in binary:

128+64+32+16+08+04+02+01= 255
1 1 1 1 1 1 1 1= 8

255.255.0.0 = /16
| 8 || 8 || 0 || 0 |
[ 11111111 11111111 00000000 00000000 ]

255.255.255.0 = /24
| 8 || 8 || 8 || 0 |
[ 11111111 11111111 11111111 00000000 ]

255.255.255.128 = /25
| 8 || 8 || 8 || 1 |
[ 11111111 11111111 11111111 10000000 ]

255.255.255.192 = /26
| 8 || 8 || 8 || 2 |
[ 11111111 11111111 11111111 11000000 ]

255.255.255.224 = /27
| 8 || 8 || 8 || 3 |
[ 11111111 11111111 11111111 11100000 ]

255.255.255.240 = /28
| 8 || 8 || 8 || 4 |
[ 11111111 11111111 11111111 11110000 ]

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