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Last active May 26, 2021 11:52
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Netmask / CIDR Translation Table
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netmask_cidr.md

Netmask / CIDR Translation Table

Netmask             Binary                              CIDR    Notes
---------------------------------------------------------------------------
255.255.255.255     11111111.11111111.11111111.11111111 /32     1   useable
255.255.255.254     11111111.11111111.11111111.11111110 /31     0   useable
255.255.255.252     11111111.11111111.11111111.11111100 /30     2   useable
255.255.255.248     11111111.11111111.11111111.11111000 /29     6   useable
255.255.255.240     11111111.11111111.11111111.11110000 /28     14  useable
255.255.255.224     11111111.11111111.11111111.11100000 /27     30  useable
255.255.255.192     11111111.11111111.11111111.11000000 /26     62  useable
255.255.255.128     11111111.11111111.11111111.10000000 /25     126 useable

255.255.255.0       11111111.11111111.11111111.00000000 /24     class C
255.255.254.0       11111111.11111111.11111110.00000000 /23
255.255.252.0       11111111.11111111.11111100.00000000 /22
255.255.248.0       11111111.11111111.11111000.00000000 /21
255.255.240.0       11111111.11111111.11110000.00000000 /20
255.255.224.0       11111111.11111111.11100000.00000000 /19
255.255.192.0       11111111.11111111.11000000.00000000 /18
255.255.128.0       11111111.11111111.10000000.00000000 /17

255.255.0.0         11111111.11111111.00000000.00000000 /16     class B
255.254.0.0         11111111.11111110.00000000.00000000 /15
255.252.0.0         11111111.11111100.00000000.00000000 /14
255.248.0.0         11111111.11111000.00000000.00000000 /13
255.240.0.0         11111111.11110000.00000000.00000000 /12
255.224.0.0         11111111.11100000.00000000.00000000 /11
255.192.0.0         11111111.11000000.00000000.00000000 /10
255.128.0.0         11111111.10000000.00000000.00000000 /9

255.0.0.0           11111111.00000000.00000000.00000000 /8      class A
254.0.0.0           11111110.00000000.00000000.00000000 /7
252.0.0.0           11111100.00000000.00000000.00000000 /6
248.0.0.0           11111000.00000000.00000000.00000000 /5
240.0.0.0           11110000.00000000.00000000.00000000 /4
224.0.0.0           11100000.00000000.00000000.00000000 /3
192.0.0.0           11000000.00000000.00000000.00000000 /2
128.0.0.0           10000000.00000000.00000000.00000000 /1
0.0.0.0             00000000.00000000.00000000.00000000 /0
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