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Calculator source:  www.thaemlitz.com

 

IPv4 Classful networks

Class Start End Default subnet mask CIDR
Class A* 0.0.0.0 127.255.255.255 255.0.0.0 /8
Class B 128.0.0.0 191.255.255.255 255.255.0.0 /16
Class C 192.0.0.0 223.255.255.255 255.255.255.0 /24
Class D (multicast) 224.0.0.0 239.255.255.255
Class E (reserved) 240.0.0.0 255.255.255.255

*127.0.0.0/8 is reserved for loopback and can not be assigned.

 

Private Network Ranges

Class Start End CIDR
Class A 10.0.0.0 10.255.255.255 /8
Class B 172.16.0.0 172.31.255.255 /12
Class C 192.168.0.0 192.168.255.255 /16

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