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IPv4 CIDR

Prefix Subnet Mask Wildcard Mask Addresses Size Usable Hosts Typical Usage
/32 255.255.255.255 0.0.0.0 1 2^0 1 Host
/31 255.255.255.254 0.0.0.1 2 2^1 0 Point to Point (RFC 3012)
/30 255.255.255.252 0.0.0.3 4 2^2 2 Point to Point
/29 255.255.255.248 0.0.0.7 8 2^3 6 Small WAN Block
/28 255.255.255.240 0.0.0.15 16 2^4 14
/27 255.255.255.224 0.0.0.31 32 2^5 30
/26 255.255.255.192 0.0.0.63 64 2^6 62
/25 255.255.255.128 0.0.0.127 128 2^7 126
/24 255.255.255.0 0.0.0.255 256 2^8 254
/23 255.255.254.0 0.0.1.255 512 2^9 510
/22 255.255.252.0 0.0.3.255 1,024 2^10 1,022
/21 255.255.248.0 0.0.7.255 2,048 2^11 2,046
/20 255.255.240.0 0.0.15.255 4,096 2^12 4,094
/19 255.255.224.0 0.0.31.255 8,192 2^13 8,190
/18 255.255.192.0 0.0.63.255 16,384 2^14 16,382
/17 255.255.128.0 0.0.127.255 32,768 2^15 32,766
/16 255.255.0.0 0.0.255.255 65,536 2^16 65,534
/15 255.254.0.0 0.1.255.255 131,072 2^17 131,070
/14 255.252.0.0 0.3.255.255 262,144 2^18 262,142
/13 255.248.0.0 0.7.255.255 524,288 2^19 524,286
/12 255.240.0.0 0.15.255.255 1,048,576 2^20 1,048,574
/11 255.224.0.0 0.31.255.255 2,097,152 2^21 2,097,150
/10 255.192.0.0 0.63.255.255 4,194,304 2^22 4,194,302
/9 255.128.0.0 0.127.255.255 8,388,608 2^23 8,388,606
/8 255.0.0.0 0.255.255.255 16,777,216 2^24 16,777,212
/7 254.0.0.0 1.255.255.255 33,554,432 2^25 33,554,430
/6 252.0.0.0 3.255.255.255 67,108,864 2^26 67,108,862
/5 248.0.0.0 7.255.255.255 134,217,728 2^27 134,217,726
/4 240.0.0.0 15.255.255.255 268,435,456 2^28 268,435,454
/3 224.0.0.0 31.255.255.255 536,870,912 2^29 536,870,910
/2 192.0.0.0 63.255.255.255 1,073,741,824 2^30 1,073,741,822
/1 128.0.0.0 127.255.255.255 2,147,483,648 2^31 2,147,483,646
/0 0.0.0.0 255.255.255.255 4,294,967,296 2^32 4,294,967,294 IPv4 Internet