Classes of computer network addresses and their default subnet masks

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Cards

Class A address range 1 - 127 (revised)
Class B address range 128 - 191 (revised)
Class C address range 192 - 223 (revised)
Class A default subnet mask 255.0.0.0  
Class B default subnet mask 255.255.0.0  
Class C default subnet mask 255.255.255.0  

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