Transcription of Subnet Mask Wildcard
1 IPV4 subnetting Subnets Decimal to Binary CIDR Subnet Mask Addresses Wildcard Subnet Mask Wildcard /32 1 255 1111 1111 0 0000 0000. /31 2 254 1111 1110 1 0000 0001. /30 4 252 1111 1100 3 0000 0011. /29 8 248 1111 1000 7 0000 0111. /28 16 240 1111 0000 15 0000 1111. /27 32 224 1110 0000 31 0001 1111. /26 64 192 1100 0000 63 0011 1111. /25 128 128 1000 0000 127 0111 1111. /24 256 0 0000 0000 255 1111 1111. /23 512 Subnet Proportion /22 1,024 /21 2,048 /20 4,096 /27. /19 8,192 /26 /28. /29. /18 16,384 /30. /17 32,768 /30. /16 65,536 /15 131,072 /14 262,144 /25. /13 524,288 /12 1,048,576 /11 2,097,152 /10 4,194,304 Classful Ranges /9 8,388,608 A /8 16,777,216 B - /7 33,554,432 C - /6 67,108,864 D - /5 134,217,728 E - /4 268,435,456 Reserved Ranges /3 536,870,912 RFC 1918 - /2 1,073,741,824 Localhost - /1 2,147,483,648 RFC 1918 - /0 4,294,967,296 RFC 1918 - Terminology CIDR VLSM.
2 Classless interdomain routing was developed to Variable-length Subnet masks are an arbitrary length provide more granularity than legacy classful between 0 and 32 bits; CIDR relies on VLSMs to define addressing; CIDR notation is expressed as /XX routes by Jeremy Stretch
