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Netmask Quick Reference Chart

Netmask Quick Reference Chart:

‘via Blog this’

Netmask Quick Reference
# bits # hosts Usable
hosts
netmask Cisco mask
/4 268435456 268435454 240.0.0.0 15.255.255.255
/5 134217728 134217726 248.0.0.0 7.255.255.255
/6 67108864 67108862 252.0.0.0 3.255.255.255
/7 33554432 33554430 254.0.0.0 1.255.255.255
/8 16777216 16777214 255.0.0.0 class A network 0.255.255.255
/9 8388608 8388606 255.128.0.0 0.127.255.255
/10 4194304 4194302 255.192.0.0 0.63.255.255
/11 2097152 2097150 255.224.0.0 0.31.255.255
/12 1048576 1048574 255.240.0.0 0.15.255.255
/13 524288 524286 255.248.0.0 0.7.255.255
/14 262144 262142 255.252.0.0 0.3.255.255
/15 131072 131070 255.254.0.0 0.1.255.255
/16 65536 65534 255.255.0.0 class B network 0.0.255.255
/17 32768 32766 255.255.128.0 0.0.127.255
/18 16384 16382 255.255.192.0 0.0.63.255
/19 8192 8190 255.255.224.0 0.0.31.255
/20 4096 4094 255.255.240.0 0.0.15.255
/21 2048 2046 255.255.248.0 0.0.7.255
/22 1024 1022 255.255.252.0 0.0.3.255
/23 512 510 255.255.254.0 0.0.1.255
/24 256 254 255.255.255.0 class C network 0.0.0.255
/25 128 126 255.255.255.128 0.0.0.127
/26 64 62 255.255.255.192 0.0.0.63
/27 32 30 255.255.255.224 0.0.0.31
/28 16 14 255.255.255.240 0.0.0.15
/29 8 6 255.255.255.248 0.0.0.7
/30 4 2 255.255.255.252 0.0.0.3
/31   point to point links only
/32 1 1 255.255.255.255 single IP address use hostnotation

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