About IP Address || Networking || CIDR Tutorials
CIDR is an acronym for Classless Inter-Domain Routing CIDR is also known as supernetting, as it effectively allows multiple subnets to be grouped together for network routing. CIDR specifies an IP address range using a combination of an IP address and its associated network mask. CIDR notation uses the following format: xxx.xxx.xxx.xxx/n where n is the number of (leftmost) '1' bits in the mask. https://erikberg.com/notes/networks.html IP Address Classification Subnet Mask CIDR Prefix Total IP's Usable IP's Number of Class C networks 255.255.255.255 /32 1 1 1/256th 255.255.255.254 /31 2 0 1/128th 255.255.255.252 /30 4 2 1/64th 255.255.255.248 /29 8 6 1/32nd 255.255.255.240 /28 16 14 1/16th 255.255.255.224 /27 32 30 1/8th 255.255.255.192 /26 64 62 1/4th 255.255.255.128 /25 128 126 1 half 255.255.255.0 /24 256 254 1 255.255.254.0 /23 512 510 2 255.255.252.0 /22 1024 1022 4 255.255.248.0 /21 2048 2046 8 255.255.240.0 /20