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EC-Council: Computer Hacking Forensic Investigator(CHFI-V10)
Module 8 : Network Forensics
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What is the CIDR from the following screenshot? Click the image for enlarge it in another window
A:    /24
B:    /32
C:    /16
D:    /8
Explanation: Classless Inter-Domain Routing (CIDR) is an IP address allocation method that improves data routing efficiency on the internet. Every machine, server, and end-user device that connects to the internet has a unique number, called an IP address, associated with it. Here are the charts, followed by some explanations of what they mean. CIDR SUBNET MASK WILDCARD MASK # OF IP ADDRESSES # OF USABLE IP ADDRESSES /32 255.255.255.255 0.0.0.0 1 1 /31 255.255.255.254 0.0.0.1 2 2* /30 255.255.255.252 0.0.0.3 4 2 /29 255.255.255.248 0.0.0.7 8 6 /28 255.255.255.240 0.0.0.15 16 14 /27 255.255.255.224 0.0.0.31 32 30 /26 255.255.255.192 0.0.0.63 64 62 /25 255.255.255.128 0.0.0.127 128 126 /24 255.255.255.0 0.0.0.255 256 254 /23 255.255.254.0 0.0.1.255 512 510 /22 255.255.252.0 0.0.3.255 1,024 1,022 /21 255.255.248.0 0.0.7.255 2,048 2,046 /20 255.255.240.0 0.0.15.255 4,096 4,094 /19 255.255.224.0 0.0.31.255 8,192 8,190 /18 255.255.192.0 0.0.63.255 16,384 16,382 /17 255.255.128.0 0.0.127.255 32,768 32,766 /16 255.255.0.0 0.0.255.255 65,536 65,534 /15 255.254.0.0 0.1.255.255 131,072 131,070 /14 255.252.0.0 0.3.255.255 262,144 262,142 /13 255.248.0.0 0.7.255.255 524,288 524,286 /12 255.240.0.0 0.15.255.255 1,048,576 1,048,574 /11 255.224.0.0 0.31.255.255 2,097,152 2,097,150 /10 255.192.0.0 0.63.255.255 4,194,304 4,194,302 /9 255.128.0.0 0.127.255.255 8,388,608 8,388,606 /8 255.0.0.0 0.255.255.255 16,777,216 16,777,214 /7 254.0.0.0 1.255.255.255 33,554,432 33,554,430 /6 252.0.0.0 3.255.255.255 67,108,864 67,108,862 /5 248.0.0.0 7.255.255.255 134,217,728 134,217,726 /4 240.0.0.0 15.255.255.255 268,435,456 268,435,454 /3 224.0.0.0 31.255.255.255 536,870,912 536,870,910 /2 192.0.0.0 63.255.255.255 1,073,741,824 1,073,741,822 /1 128.0.0.0 127.255.255.255 2,147,483,648 2,147,483,646 /0 0.0.0.0 255.255.255.255 4,294,967,296 4,294,967,294 * /31 is a special case detailed in RFC 3021 where networks with this type of subnet mask can assign two IP addresses as a point-to-point link.