Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP). It is one of the core protocols of standards-based internetworking methods on the Internet and other packet-switched networks. IPv4 was the first version deployed for production in the ARPANET in 1983.

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 1,31,072 0.1.255.255
/14 255.252.0.0 2,62,144 0.3.255.255
/13 255.248.0.0 5,24,288 0.7.255.255
/12 255.240.0.0 10,48,576 0.15.255.255
/11 255.224.0.0 20,97,152 0.31.255.255
/10 255.192.0.0 41,94,304 0.63.255.255
/9 255.128.0.0 83,88,608 0.127.255.255
/8 255.0.0.0 1,67,77,216 0.255.255.255
/7 254.0.0.0 3,35,54,432 1.255.255.255
/6 252.0.0.0 6,71,08,864 3.255.255.255
/5 248.0.0.0 13,42,17,728 7.255.255.255
/4 240.0.0.0 26,84,35,456 15.255.255.255
/3 224.0.0.0 53,68,70,912 31.255.255.255
/2 192.0.0.0 1,07,37,41,824 63.255.255.255
/1 128.0.0.0 2,14,74,83,648 127.255.255.255
/0 0.0.0.0 4,29,49,67,296 255.255.255.255

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