ip subnet cheatsheet

Subnet Cheatsheet CIDR Netmask 1st Octet 2nd Octet 3rd Octet 4th Octet Class C 32 255.255.255.255 11111111 11111111 11111111 11111111 1 - - 31 255.255.255.254 11111111 11111111 11111111 11111110 2 - - 30 255.255.255.252 11111111 11111111 11111111 11111100 4 - - 29 255.255.255.248 11111111 11111111 11111111 11111000 8 - - 28 255.255.255.240 11111111 11111111 11111111 11110000 16 - - 27 255.255.255.224 11111111 11111111 11111111 11100000 32 - - 26 255.255.255.192 11111111 11111111 11111111 11000000 64 - - 25 255.255.255.128 11111111 11111111 11111111 10000000 128 - - 24 255.255.255.0 11111111 11111111 11111111 00000000 256 1 - Class B 23 255.255.254.0 11111111 11111111 11111110 00000000 512 2 - 22 255.255.252.0 11111111 11111111 11111100 00000000 1,024 4 - 21 255.255.248.0 11111111 11111111 11111000 00000000 2,048 8 - 20 255.255.240.0 11111111 11111111 11110000 00000000 4,096 16 - 19 255.255.224.0 11111111 11111111 11100000 00000000 8,192 32 - 18 255.255.192.0 11111111 11111111 11000000 00000000 16,384 64 - 17 255.255.128.0 11111111 11111111 10000000 00000000 32,768 128 - 16 255.255.0.0 11111111 11111111 00000000 00000000 65,536 256 - Class A 15 255.254.0.0 11111111 11111110 00000000 00000000 131,072 512 1 14 255.252.0.0 11111111 11111100 00000000 00000000 262,144 1,024 2 13 255.248.0.0 11111111 11111000 00000000 00000000 524,288 2,048 4 12 255.240.0.0 11111111 11110000 00000000 00000000 1,048,576 4,096 8 11 255.224.0.0 11111111 11100000 00000000 00000000 2,097,152 8,192 16 10 255.192.0.0 11111111 11000000 00000000 00000000 4,194,304 16,384 32 9 255.128.0.0 11111111 10000000 00000000 00000000 8,388,608 32,768 64 8 255.0.0.0 11111111 00000000 00000000 00000000 16,777,216 65,536 128 Courtesy of KnowtheNetwork.com # of IP Addresses # of Class C Networks # of Class B Networks

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A Quick Reference guide to Subnets

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Subnet Cheatsheet

CIDR Netmask 1st Octet 2nd Octet 3rd Octet 4th Octet # of IP Addresses

Clas

s C

32 255.255.255.255 11111111 11111111 11111111 11111111 1 - -31 255.255.255.254 11111111 11111111 11111111 11111110 2 - -30 255.255.255.252 11111111 11111111 11111111 11111100 4 - -29 255.255.255.248 11111111 11111111 11111111 11111000 8 - -28 255.255.255.240 11111111 11111111 11111111 11110000 16 - -27 255.255.255.224 11111111 11111111 11111111 11100000 32 - -26 255.255.255.192 11111111 11111111 11111111 11000000 64 - -25 255.255.255.128 11111111 11111111 11111111 10000000 128 - -24 255.255.255.0 11111111 11111111 11111111 00000000 256 1 -

Clas

s B

23 255.255.254.0 11111111 11111111 11111110 00000000 512 2 -22 255.255.252.0 11111111 11111111 11111100 00000000 1,024 4 -21 255.255.248.0 11111111 11111111 11111000 00000000 2,048 8 -20 255.255.240.0 11111111 11111111 11110000 00000000 4,096 16 -19 255.255.224.0 11111111 11111111 11100000 00000000 8,192 32 -18 255.255.192.0 11111111 11111111 11000000 00000000 16,384 64 -17 255.255.128.0 11111111 11111111 10000000 00000000 32,768 128 -16 255.255.0.0 11111111 11111111 00000000 00000000 65,536 256 -

Clas

s A

15 255.254.0.0 11111111 11111110 00000000 00000000 131,072 512 114 255.252.0.0 11111111 11111100 00000000 00000000 262,144 1,024 213 255.248.0.0 11111111 11111000 00000000 00000000 524,288 2,048 412 255.240.0.0 11111111 11110000 00000000 00000000 1,048,576 4,096 811 255.224.0.0 11111111 11100000 00000000 00000000 2,097,152 8,192 1610 255.192.0.0 11111111 11000000 00000000 00000000 4,194,304 16,384 329 255.128.0.0 11111111 10000000 00000000 00000000 8,388,608 32,768 648 255.0.0.0 11111111 00000000 00000000 00000000 16,777,216 65,536 128

Courtesy of KnowtheNetwork.com

# of Class C Networks

# of Class B Networks

http://knowthenetwork.com/

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