CIDR Cheat Sheet
Tabella di riferimento rapido per tutti i prefissi IPv4 da /0 a /32 con netmask, wildcard e numero di host.
| Prefisso | Netmask | Wildcard | Indirizzi totali | Host utilizzabili | Note |
|---|---|---|---|---|---|
| /0 | 0.0.0.0 | 255.255.255.255 | 4 294 967 296 | 4 294 967 294 | default route |
| /1 | 128.0.0.0 | 127.255.255.255 | 2 147 483 648 | 2 147 483 646 | |
| /2 | 192.0.0.0 | 63.255.255.255 | 1 073 741 824 | 1 073 741 822 | |
| /3 | 224.0.0.0 | 31.255.255.255 | 536 870 912 | 536 870 910 | |
| /4 | 240.0.0.0 | 15.255.255.255 | 268 435 456 | 268 435 454 | |
| /5 | 248.0.0.0 | 7.255.255.255 | 134 217 728 | 134 217 726 | |
| /6 | 252.0.0.0 | 3.255.255.255 | 67 108 864 | 67 108 862 | |
| /7 | 254.0.0.0 | 1.255.255.255 | 33 554 432 | 33 554 430 | |
| /8 | 255.0.0.0 | 0.255.255.255 | 16 777 216 | 16 777 214 | classe A |
| /9 | 255.128.0.0 | 0.127.255.255 | 8 388 608 | 8 388 606 | |
| /10 | 255.192.0.0 | 0.63.255.255 | 4 194 304 | 4 194 302 | |
| /11 | 255.224.0.0 | 0.31.255.255 | 2 097 152 | 2 097 150 | |
| /12 | 255.240.0.0 | 0.15.255.255 | 1 048 576 | 1 048 574 | |
| /13 | 255.248.0.0 | 0.7.255.255 | 524 288 | 524 286 | |
| /14 | 255.252.0.0 | 0.3.255.255 | 262 144 | 262 142 | |
| /15 | 255.254.0.0 | 0.1.255.255 | 131 072 | 131 070 | |
| /16 | 255.255.0.0 | 0.0.255.255 | 65 536 | 65 534 | classe B |
| /17 | 255.255.128.0 | 0.0.127.255 | 32 768 | 32 766 | |
| /18 | 255.255.192.0 | 0.0.63.255 | 16 384 | 16 382 | |
| /19 | 255.255.224.0 | 0.0.31.255 | 8 192 | 8 190 | |
| /20 | 255.255.240.0 | 0.0.15.255 | 4 096 | 4 094 | |
| /21 | 255.255.248.0 | 0.0.7.255 | 2 048 | 2 046 | |
| /22 | 255.255.252.0 | 0.0.3.255 | 1 024 | 1 022 | |
| /23 | 255.255.254.0 | 0.0.1.255 | 512 | 510 | |
| /24 | 255.255.255.0 | 0.0.0.255 | 256 | 254 | classe C |
| /25 | 255.255.255.128 | 0.0.0.127 | 128 | 126 | |
| /26 | 255.255.255.192 | 0.0.0.63 | 64 | 62 | |
| /27 | 255.255.255.224 | 0.0.0.31 | 32 | 30 | |
| /28 | 255.255.255.240 | 0.0.0.15 | 16 | 14 | |
| /29 | 255.255.255.248 | 0.0.0.7 | 8 | 6 | |
| /30 | 255.255.255.252 | 0.0.0.3 | 4 | 2 | |
| /31 | 255.255.255.254 | 0.0.0.1 | 2 | 2 | RFC 3021 (P2P) |
| /32 | 255.255.255.255 | 0.0.0.0 | 1 | 1 | host singolo |