Steve Friedl har kn?pat ihop en riktigt enkel och tydlig tabell f?r n?tmasker (netmask)
| Bitar | Adresse | Anv?ndbara adresser | N?tmask | 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 (Klass A n?t) | 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 (Klass B n?t) | 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 (Klas C n?t) | 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 | 31 | 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 | Endast | punkt till | punkt | anslutningar |
| /32 | 1 | 1 | 255.255.255.255 |