1: 127.255.0.0
2: 63.255.0.0
3: 31.255.0.0
4: 15.255.0.0
5: 7.255.0.0
6: 3.255.0.0
7: 1.255.0.0
8: 0.255.0.0
9: 0.127.0.0
10: 0.63.0.0
11: 0.31.0.0
12: 0.15.0.0
13: 0.7.0.0
14: 0.3.0.0
15: 0.1.0.0
16: 0.0.0.0
17: 0.0.128.0
18: 0.0.192.0
19: 0.0.224.0
20: 0.0.240.0
21: 0.0.248.0
22: 0.0.252.0
23: 0.0.254.0
24: 0.0.255.0
25: 0.0.255.128
26: 0.0.255.192
27: 0.0.255.224
28: 0.0.255.240
29: 0.0.255.248
30: 0.0.255.252
31: 0.0.255.254
32: 0.0.255.255