Network Quick Reference
Class Quick Reference
| Class |
Bits |
Start |
End |
Networks |
Default Mask |
CIDR |
| A |
0 |
0.0.0.0 |
127.255.255.255 |
128 |
255.0.0.0 |
/8 |
| B |
10 |
128.0.0.0 |
191.255.255.255 |
16384 |
255.255.0.0 |
/16 |
| C |
110 |
192.0.0.0 |
223.255.255.255 |
2097152 |
255.255.255.0 |
/24 |
| D (mcast) |
1110 |
224.0.0.0 |
239.255.255.255 |
undef |
undef |
undef |
| E (rsrvd) |
1111 |
240.0.0.0 |
255.255.255.255 |
undef |
undef |
undef |
Netmask Quick Reference
| Bits |
Total Hosts |
Usable |
Netmask |
Inverse Mask |
/0 |
4294967296 (2^32) |
4294967294 |
0.0.0.0 |
255.255.255.255 |
/1 |
2147483648 (2^31) |
2147483646 |
128.0.0.0 |
127.255.255.255 |
/2 |
1073741824 (2^30) |
1073741822 |
192.0.0.0 |
63.255.255.255 |
/3 |
536870912 (2^29) |
536870910 |
224.0.0.0 |
31.255.255.255 |
/4 |
268435456 (2^28) |
268435454 |
240.0.0.0 |
15.255.255.255 |
/5 |
134217728 (2^27) |
134217726 |
248.0.0.0 |
7.255.255.255 |
/6 |
67108864 (2^26) |
67108862 |
252.0.0.0 |
3.255.255.255 |
/7 |
33554432 (2^25) |
33554430 |
254.0.0.0 |
1.255.255.255 |
/8 |
16777216 (2^24) |
16777214 |
255.0.0.0 |
0.255.255.255 |
/9 |
8388608 (2^23) |
8388606 |
255.128.0.0 |
0.127.255.255 |
/10 |
4194304 (2^22) |
4194302 |
255.192.0.0 |
0.63.255.255 |
/11 |
2097152 (2^21) |
2097150 |
255.224.0.0 |
0.31.255.255 |
/12 |
1048576 (2^20) |
1048574 |
255.240.0.0 |
0.15.255.255 |
/13 |
524288 (2^19) |
524286 |
255.248.0.0 |
0.7.255.255 |
/14 |
262144 (2^18) |
262142 |
255.252.0.0 |
0.3.255.255 |
/15 |
131072 (2^17) |
131070 |
255.254.0.0 |
0.1.255.255 |
/16 |
65536 (2^16) |
65534 |
255.255.0.0 |
0.0.255.255 |
/17 |
32768 (2^15) |
32766 |
255.255.128.0 |
0.0.127.255 |
/18 |
16384 (2^14) |
16382 |
255.255.192.0 |
0.0.63.255 |
/19 |
8192 (2^13) |
8190 |
255.255.224.0 |
0.0.31.255 |
/20 |
4096 (2^12) |
4094 |
255.255.240.0 |
0.0.15.255 |
/21 |
2048 (2^11) |
2046 |
255.255.248.0 |
0.0.7.255 |
/22 |
1024 (2^10) |
1022 |
255.255.252.0 |
0.0.3.255 |
/23 |
512 (2^9) |
510 |
255.255.254.0 |
0.0.1.255 |
/24 |
256 (2^8) |
254 |
255.255.255.0 |
0.0.0.255 |
/25 |
128 (2^7) |
126 |
255.255.255.128 |
0.0.0.127 |
/26 |
64 (2^6) |
62 |
255.255.255.192 |
0.0.0.63 |
/27 |
32 (2^5) |
30 |
255.255.255.224 |
0.0.0.31 |
/28 |
16 (2^4) |
14 |
255.255.255.240 |
0.0.0.15 |
/29 |
8 (2^3) |
6 |
255.255.255.248 |
0.0.0.7 |
/30 |
4 (2^2) |
2 |
255.255.255.252 |
0.0.0.3 |
/31 |
2 (2^1) |
0 |
255.255.255.254 |
0.0.0.1 |
/32 |
1 (2^0) |
1 |
255.255.255.255 |
0.0.0.0 |
