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Quick reference guide for Subnetting questions.

 

Classful A: 0 - 127

Classful B: 128 - 191

Classful C: 192 - 223

Class D: 224 - 247

 

/ 8 = 255.0.0.0

/16 = 255.255.0.0

/24 = 255.255.255.0

 

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Classful Octet Values

Class A: 0-127

Class B: 128-191

Class C: 192-223

Class D: 224-239

Class E: 240-255

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