Convert a Prefix Length into a Wildcard Mask and a Subnet Mask

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Paradise Valley Community College *

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140AB

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Computer Science

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Oct 30, 2023

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Convert a Prefix Length into a Wildcard Mask and a Subnet Mask The prefix length is also written as a subnet mask in dotted decimal. 1. One way to convert the prefix length into a subnet mask is to write out a 32-bit binary number where, starting from the left, write the prefix length worth of 1s and the remaining bits as 0s. For example: Prefix Length = 17 11111111111111111 000000000000000 11111111.11111111.1 0000000.00000000 The Subnet Mask = 255.255.128.0 2. An easier method is to use the table on the last page and lookup the subnet mask. 3. To find the Wildcard Mask, replace the 1s in the binary Subnet Mask with 0s and replace all the 0s with 1s. Or again look it up in the table on the last page. 00000000000000000 111111111111111 00000000.00000000.0 1111111.11111111 The Wildcard Mask = 0.0.127.255 Convert the following prefix lengths into wildcard and subnet masks. Prefix Length Wildcard Mask Subnet Mask 12 0.15.255.255 255.240.0.0 26 0.0.63.255 255.255.255.192 14 0.3.255.255 255.252.0.0 22 0.0.3.255 255.255.252.0 9 0.127.255.255 255.128.0.0 16 0.0.255.255 255.255.0.0 10 0.63.255.255 255.192.0.0 16 - 0s 17 - 1s 16 - 1s 17 - 0s
25 0.0.0.127 255.255.255.128 11 0.31.255.255 255.224.0.0 13 0.7.255.255 255.248.0.0 2 n , n = bits Hosts or Subnets Prefix Length Subnet Mask 2 0 1 /32 255.255.255.255 2 1 2 /31 255.255.255.254 2 2 4 /30 255.255.255.252 2 3 8 /29 255.255.255.248 2 4 16 /28 255.255.255.240 2 5 32 /27 255.255.255.224 2 6 64 /26 255.255.255.192 2 7 128 /25 255.255.255.128 2 8 256 /24 255.255.255.0 2 9 512 /23 255.255.254.0 2 10 1024 /22 255.255.252.0 2 11 2048 /21 255.255.248.0 2 12 4096 /20 255.255.240.0 2 13 8192 /19 255.255.224.0 2 14 16384 /18 255.255.192.0 2 15 32768 /17 255.255.128.0 2 16 65536 /16 255.255.0.0 2 17 131072 /15 255.254.0.0 2 18 262144 /14 255.252.0.0 2 19 524288 /13 255.248.0.0 2 20 1048576 /12 255.240.0.0 2 21 2097152 /11 255.224.0.0 2 22 4194304 /10 255.192.0.0 2 23 8388608 /9 255.128.0.0 2 24 16777216 /8 255.0.0.0 2 25 33554432 /7 254.0.0.0 2 26 67108864 /6 252.0.0.0 2 27 134217728 /5 248.0.0.0 2 28 268435456 /4 240.0.0.0 2 29 536870912 /3 224.0.0.0 2 30 1073741824 /2 192.0.0.0 2 31 2147483648 /1 128.0.0.0 2 32 4294967296 /0 0.0.0.0
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