#bitmask    address
0           0.0.0.0
1           128.0.0.0
2           192.0.0.0
3           224.0.0.0
4           240.0.0.0
5           248.0.0.0
6           252.0.0.0
7           254.0.0.0
8           255.0.0.0
9           255.128.0.0
10          255.192.0.0
11          255.224.0.0
12          255.240.0.0
13          255.248.0.0
14          255.252.0.0
15          255.254.0.0
16          255.255.0.0
17          255.255.128.0
18          255.255.192.0
19          255.255.224.0
20          255.255.240.0
21          255.255.248.0
22          255.255.252.0
23          255.255.254.0
24          255.255.255.0
25          255.255.255.128
26          255.255.255.192
27          255.255.255.224
28          255.255.255.240
29          255.255.255.248
30          255.255.255.252
31          255.255.255.254
32          255.255.255.255
