Prefix
|
Mask
|
No of Usable Host
|
Block Size
|
/30
|
252
|
2
|
4
|
/29
|
248
|
6
|
8
|
/28
|
240
|
14
|
16
|
/27
|
224
|
30
|
32
|
/26
|
192
|
62
|
64
|
/25
|
128
|
126
|
128
|
/24
|
0
|
254
|
256
|
/23
|
254.0
|
510
|
512
|
/22
|
252.0
|
1022
|
1024
|
/21
|
248.0
|
2046
|
2048
|
/20
|
240.0
|
4094
|
4096
|
/19
|
224.0
|
8190
|
8192
|
/18
|
192.0
|
16382
|
16384
|
/17
|
128.0
|
32766
|
32768
|
/16
|
0.0
|
65534
|
65536
|
Host/Subnet size Table
Class B Effective Effective
# bits Mask Subnets Hosts
------- --------------- --------- ---------
2 255.255.192.0 2 16382
3 255.255.224.0 6 8190
4 255.255.240.0 14 4094
5 255.255.248.0 30 2046
6 255.255.252.0 62 1022
7 255.255.254.0 126 510
8 255.255.255.0 254 254
9 255.255.255.128 510 126
10 255.255.255.192 1022 62
11 255.255.255.224 2046 30
12 255.255.255.240 4094 14
13 255.255.255.248 8190 6
14 255.255.255.252 16382 2
Class C Effective Effective
# bits Mask Subnets Hosts
------- --------------- --------- ---------
2 255.255.255.192 2 62
3 255.255.255.224 6 30
4 255.255.255.240 14 14
5 255.255.255.248 30 6
6 255.255.255.252 62 2
