Download (Cheat Sheet and more Slides Network Analysis in PDF only on Docsity! SUBNETTING packetlife.net Subnet Chart CIDR Subnet Mask Addresses Wildcard /32 255.255.255.255 1 0.0.0.0 /31 255.255.255.254 2 0.0.0.1 /30 255.255.255.252 4 0.0.0.3 /29 255.255.255.248 8 0.0.0.7 /28 255.255.255.240 16 0.0.0.15 /27 255.255.255.224 32 0.0.0.31 /26 255.255.255.192 64 0.0.0.63 /25 255.255.255.128 128 0.0.0.127 /24 255.255.255.0 256 0.0.0.255 /23 255.255.254.0 512 0.0.1.255 /22 255.255.252.0 1,024 0.0.3.255 /21 255.255.248.0 2,048 0.0.7.255 /20 255.255.240.0 4,096 0.0.15.255 /19 255.255.224.0 8,192 0.0.31.255 /18 255.255.192.0 16,384 0.0.63.255 /17 255.255.128.0 32,768 0.0.127.255 /16 255.255.0.0 65,536 0.0.255.255 /15 255.254.0.0 131,072 0.1.255.255 /14 255.252.0.0 262,144 0.3.255.255 /13 255.248.0.0 524,288 0.7.255.255 /12 255.240.0.0 1,048,576 0.15.255.255 /11 255.224.0.0 2,097,152 0.31.255.255 /10 255.192.0.0 4,194,304 0.63.255.255 /9 255.128.0.0 8,388,608 0.127.255.255 /8 255.0.0.0 16,777,216 0.255.255.255 /7 254.0.0.0 33,554,432 1.255.255.255 /6 252.0.0.0 67,108,864 3.255.255.255 /5 248.0.0.0 134,217,728 7.255.255.255 /4 240.0.0.0 268,435,456 15.255.255.255 /3 224.0.0.0 536,870,912 31.255.255.255 /2 192.0.0.0 1,073,741,824 63.255.255.255 /1 128.0.0.0 2,147,483,648 127.255.255.255 /0 0.0.0.0 4,294,967,296 255.255.255.255 Decimal to Binary Subnet Mask 255 1111 1111 254 1111 1110 252 1111 1100 248 1111 1000 240 1111 0000 224 1110 0000 192 1100 0000 128 1000 0000 0 0000 0000 Wildcard 0 0000 0000 1 0000 0001 3 0000 0011 7 0000 0111 15 0000 1111 31 0001 1111 63 0011 1111 127 0111 1111 255 1111 1111 Subnet Proportion Classful Ranges A 0.0.0.0 - 127.255.255.255 B 128.0.0.0 - 191.255.255.255 C 192.0.0.0 - 223.255.255.255 D 224.0.0.0 - 239.255.255.255 E 240.0.0.0 - 255.255.255.255 Reserved Ranges RFC1918 10.0.0.0 - 10.255.255.255 Localhost 127.0.0.0 - 127.255.255.255 RFC1918 172.16.0.0 - 172.31.255.255 RFC1918 192.168.0.0 - 192.168.255.255 Determine Usable Hosts Total Addresses - Subnet ID - Broadcast Address Usable hosts 256 - 1 - 1 254 Terminology CIDR · Classless interdomain routing was developed to provide more granularity than legacy classful addressing; masks expressed in the form /XX are in CIDR notation VLSM · Variable length subnet masks are an arbitrary length between 0 and 32 bits; CIDR relies on VLSMs to define routes by Jeremy Stretch v1.0
