255.0.0.0
8
16777216-2=16777214
255.128.0.0
9
8388608-2=8388606
255.192.0.0
10
4194304-2=4194302
255.224.0.0
11
2097152-2=2097150
255.240.0.0
12
1048576-2=1048574
255.248.0.0
13
524288-2=524286
255.252.0.0
14
262143=262142
255.254.0.0
15
131072-2=131070
255.255.0.0
16
65536-2=65534
255.255.128.0
17
32768-2=32766
255.255.192.0
18
16384-2=16382
255.255.224.0
19
8192-2=8190
255.255.240.0
20
4096-2=4094
255.255.248.0
21
2048-2=2046
255.255.252.0
22
1024-2=1022
255.255.254.0
23
511=510
255.255.255.0
24
256-2=254
255.255.255.128
25
128-2=126
255.255.255.192
26
64-2=62
255.255.255.224
27
31=30
255.255.255.240
28
16-2=14
255.255.255.248
29
8-2=6
255.255.255.252
30
4-2=2