La tabella seguente mostra le corrispondenze che esistono tra una subnet mask descritta con annotazione CIDR, la corrispondente subnet inversa (o wildcard mask) utilizzata spesso per creare le ACL negli apparati CISCO, la sua forma binaria, il numero di reti che comprende tale subnet e il totale degli indirizzi IP a disposizione per quella subnet.
| CIDR | Subnet Mask | Wildcard Mask (Subnet Inversa) | Subnet Mask (in Binario) | N° di Reti | Totale IP Utilizzabili |
| /1 | 128.0.0.0 | 127.255.255.255 | 1000 0000 0000 0000 0000 0000 0000 0000 | 128 A | 2.147.483.646 |
| /2 | 192.0.0.0 | 63.255.255.255 | 1100 0000 0000 0000 0000 0000 0000 0000 | 64 A | 1.073.741.822 |
| /3 | 224.0.0.0 | 31.255.255.255 | 1110 0000 0000 0000 0000 0000 0000 0000 | 32 A | 536.870.910 |
| /4 | 240.0.0.0 | 15.255.255.255 | 1111 0000 0000 0000 0000 0000 0000 0000 | 16 A | 268.435.454 |
| /5 | 248.0.0.0 | 7.255.255.255 | 1111 1000 0000 0000 0000 0000 0000 0000 | 8 A | 134.217.726 |
| /6 | 252.0.0.0 | 3.255.255.255 | 1111 1100 0000 0000 0000 0000 0000 0000 | 4 A | 67.108.862 |
| /7 | 254.0.0.0 | 1.255.255.255 | 1111 1110 0000 0000 0000 0000 0000 0000 | 2 A | 33.554.430 |
| /8 | 255.0.0.0 | 0.255.255.255 | 1111 1111 0000 0000 0000 0000 0000 0000 | 1 A oppure 256 B | 16.777.214 |
| /9 | 255.128.0.0 | 0.127.255.255 | 1111 1111 1000 0000 0000 0000 0000 0000 | 128 B | 8.388.606 |
| /10 | 255.192.0.0 | 0.63.255.255 | 1111 1111 1100 0000 0000 0000 0000 0000 | 64 B | 4.194.302 |
| /11 | 255.224.0.0 | 0.31.255.255 | 1111 1111 1110 0000 0000 0000 0000 0000 | 32 B | 2.097.150 |
| /12 | 255.240.0.0 | 0.15.255.255 | 1111 1111 1111 0000 0000 0000 0000 0000 | 16 B | 1.048.574 |
| /13 | 255.248.0.0 | 0.7.255.255 | 1111 1111 1111 1000 0000 0000 0000 0000 | 8 B | 524.286 |
| /14 | 255.252.0.0 | 0.3.255.255 | 1111 1111 1111 1100 0000 0000 0000 0000 | 4 B | 262.142 |
| /15 | 255.254.0.0 | 0.1.255.255 | 1111 1111 1111 1110 0000 0000 0000 0000 | 2 B | 131.070 |
| /16 | 255.255.0.0 | 0.0.255.255 | 1111 1111 1111 1111 0000 0000 0000 0000 | 1 B oppure 256 C | 65.534 |
| /17 | 255.255.128.0 | 0.0.127.255 | 1111 1111 1111 1111 1000 0000 0000 0000 | 128 C | 32.766 |
| /18 | 255.255.192.0 | 0.0.63.255 | 1111 1111 1111 1111 1100 0000 0000 0000 | 64 C | 16.382 |
| /19 | 255.255.224.0 | 0.0.31.255 | 1111 1111 1111 1111 1110 0000 0000 0000 | 32 C | 8.190 |
| /20 | 255.255.240.0 | 0.0.15.255 | 1111 1111 1111 1111 1111 0000 0000 0000 | 16 C | 4.094 |
| /21 | 255.255.248.0 | 0.0.7.255 | 1111 1111 1111 1111 1111 1000 0000 0000 | 8 C | 2.046 |
| /22 | 255.255.252.0 | 0.0.3.255 | 1111 1111 1111 1111 1111 1100 0000 0000 | 4 C | 1.022 |
| /23 | 255.255.254.0 | 0.0.1.255 | 1111 1111 1111 1111 1111 1110 0000 0000 | 2 C | 510 |
| /24 | 255.255.255.0 | 0.0.0.255 | 1111 1111 1111 1111 1111 1111 0000 0000 | 1 C | 254 |
| /25 | 255.255.255.128 | 0.0.0.127 | 1111 1111 1111 1111 1111 1111 1000 0000 | 1/2 C | 126 |
| /26 | 255.255.255.192 | 0.0.0.63 | 1111 1111 1111 1111 1111 1111 1100 0000 | 1/4 C | 62 |
| /27 | 255.255.255.224 | 0.0.0.31 | 1111 1111 1111 1111 1111 1111 1110 0000 | 1/8 C | 30 |
| /28 | 255.255.255.240 | 0.0.0.15 | 1111 1111 1111 1111 1111 1111 1111 0000 | 1/16 C | 14 |
| /29 | 255.255.255.248 | 0.0.0.7 | 1111 1111 1111 1111 1111 1111 1111 1000 | 1/32 C | 6 |
| /30 | 255.255.255.252 | 0.0.0.3 | 1111 1111 1111 1111 1111 1111 1111 1100 | 1/64 C | 2 |
| /31 | 255.255.255.254 | 0.0.0.1 | 1111 1111 1111 1111 1111 1111 1111 1110 | 1/128 C | 0 |
| /32 | 255.255.255.255 | 0.0.0.0 | 1111 1111 1111 1111 1111 1111 1111 1111 | 1/256 C | 1 |