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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 ]