Existe una notacion abreviada para representa la informacion de una IP de una maskara de red. El numero en la abreviatura “/xx” viene del numero de bits de la mascara de red. La convencion es siempre iniciar desde el octeto final de la direccion de la mascara de red de 32 bits (IPv4). La tabla siguiente ilustra la correspondencia entre la notacion “/xx” y la actual representacion numerica.
| Subnet Mask | # of Addresses | Subnet Mask | # of Addresses | |||
|---|---|---|---|---|---|---|
| /1 | 128.0.0.0 | 2.1 billion | /17 | 255.255.128.0 | 32,766 | |
| /2 | 192.0.0.0 | 1 billion | /18 | 255.255.192.0 | 16,382 | |
| /3 | 224.0.0.0 | 536 million | /19 | 255.255.224.0 | 8,190 | |
| /4 | 240.0.0.0 | 268 million | /20 | 255.255.240.0 | 4,094 | |
| /5 | 248.0.0.0 | 134 million | /21 | 255.255.248.0 | 2,046 | |
| /6 | 252.0.0.0 | 67 million | /22 | 255.255.252.0 | 1,022 | |
| /7 | 254.0.0.0 | 34 million | /23 | 255.255.254.0 | 510 | |
| /8 | 255.0.0.0 | 17 million (Class A) | /24 | 255.255.255.0 | 254 (Class C) | |
| /9 | 255.128.0.0 | 8.4 million | /25 | 255.255.255.128 | 126 | |
| /10 | 255.192.0.0 | 4.2 million | /26 | 255.255.255.192 | 62 | |
| /11 | 255.224.0.0 | 2.1 million | /27 | 255.255.255.224 | 30 | |
| /12 | 255.240.0.0 | 1 million | /28 | 255.255.255.240 | 14 | |
| /13 | 255.248.0.0 | 524 thousand | /29 | 255.255.255.248 | 6 | |
| /14 | 255.252.0.0 | 262 thousand | /30 | 255.255.255.252 | 2 | |
| /15 | 255.254.0.0 | 131 thousand | /31 | 255.255.255.254 | RFC 3021 | |
| /16 | 255.255.0.0 | 65,534 (Class B) | /32 | 255.255.255.255 | Loopback address |
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