 ModemHelp.Net Recommends: Click here to run a Free driver update scan
Netmask CIDR Reference Table
| CIDR |
Decimal |
Inverse (Cisco Filter) |
Hexadecimal |
Addresses |
Usable Addresses |
Class |
| /1 |
128.0.0.0 |
127.255.255.255 |
80.00.00.00 |
2147483648 |
2147483646 |
128 Class A's |
| /2 |
192.0.0.0 |
63.255.255.255 |
C0.00.00.00 |
1073741824 |
1073741822 |
64 Class A's |
| /3 |
224.0.0.0 |
31.255.255.255 |
E0.00.00.00 |
536870912 |
536870910 |
32 Class A's |
| /4 |
240.0.0.0 |
15.255.255.255 |
F0.00.00.00 |
268435456 |
268435454 |
16 Class A's |
| /5 |
248.0.0.0 |
7.255.255.255 |
F8.00.00.00 |
134217728 |
134217726 |
8 Class A's |
| /6 |
252.0.0.0 |
3.255.255.255 |
FC.00.00.00 |
67108864 |
67108862 |
4 Class A's |
| /7 |
254.0.0.0 |
1.255.255.255 |
FE.00.00.00 |
33554432 |
33554430 |
2 Class A's |
| /8 |
255.0.0.0 |
0.255.255.255 |
FF.00.00.00 |
16777216 |
16777214 |
Class A |
| /9 |
255.128.0.0 |
0.127.255.255 |
FF.80.00.00 |
8388608 |
8388606 |
128 Class B's |
| /10 |
255.192.0.0 |
0.63.255.255 |
FF.C0.00.00 |
4194304 |
4194302 |
64 Class B's |
| /11 |
255.224.0.0 |
0.31.255.255 |
FF.E0.00.00 |
2097152 |
2097150 |
32 Class B's |
| /12 |
255.240.0.0 |
0.15.255.255 |
FF.F0.00.00 |
1048576 |
1048574 |
16 Class B's |
| /13 |
255.248.0.0 |
0.7.255.255 |
FF.F8.00.00 |
524288 |
524286 |
8 Class B's |
| /14 |
255.252.0.0 |
0.3.255.255 |
FF.FC.00.00 |
262144 |
262142 |
4 Class B's |
| /15 |
255.254.0.0 |
0.1.255.255 |
FF.FE.00.00 |
131072 |
131070 |
2 Class B's |
| /16 |
255.255.0.0 |
0.0.255.255 |
FF.FF.00.00 |
65536 |
65534 |
Class B |
| /17 |
255.255.128.0 |
0.0.127.255 |
FF.FF.80.00 |
32768 |
32766 |
128 Class C's |
| /18 |
255.255.192.0 |
0.0.63.255 |
FF.FF.C0.00 |
16384 |
16382 |
64 Class C's |
| /19 |
255.255.224.0 |
0.0.31.255 |
FF.FF.E0.00 |
8192 |
8190 |
32 Class C's |
| /20 |
255.255.240.0 |
0.0.15.255 |
FF.FF.F0.00 |
4096 |
4094 |
16 Class C's |
| /21 |
255.255.248.0 |
0.0.7.255 |
FF.FF.F8.00 |
2048 |
2046 |
8 Class C's |
| /22 |
255.255.252.0 |
0.0.3.255 |
FF.FF.FC.00 |
1024 |
1022 |
4 Class C's |
| /23 |
255.255.254.0 |
0.0.1.255 |
FF.FF.FE.00 |
512 |
510 |
2 Class C's |
| /24 |
255.255.255.0 |
0.0.0.255 |
FF.FF.FF.00 |
256 |
254 |
Class C |
| /25 |
255.255.255.128 |
0.0.0.127 |
FF.FF.FF.80 |
128 |
126 |
- |
| /26 |
255.255.255.192 |
0.0.0.63 |
FF.FF.FF.C0 |
64 |
62 |
- |
| /27 |
255.255.255.224 |
0.0.0.31 |
FF.FF.FF.E0 |
32 |
30 |
- |
| /28 |
255.255.255.240 |
0.0.0.15 |
FF.FF.FF.F0 |
16 |
14 |
- |
| /29 |
255.255.255.248 |
0.0.0.7 |
FF.FF.FF.F8 |
8 |
6 |
- |
| /30 |
255.255.255.252 |
0.0.0.3 |
FF.FF.FF.FC |
4 |
2 |
- |
| /31 |
255.255.255.254 |
0.0.0.1 |
FF.FF.FF.FE |
2 |
0 |
(unusable) |
| /32 |
255.255.255.255 |
0.0.0.0 |
FF.FF.FF.FF |
1 |
1 |
- |
Provided by http://www.raiden.net. Thanks Steve!
|
