子網掩碼對應位數
8位子網掩碼:255.0.0.0
9位子網掩碼:255.128.0.0
10位子網掩碼:255.192.0.0
11位子網掩碼:255.224.0.0
12位子網掩碼:255.240.0.0
13位子網掩碼:255.248.0.0
14位子網掩碼:255.252.0.0
15位子網掩碼:255.254.0.0
16位子網掩碼:255.255.0.0
17位子網掩碼:255.255.128.0
18位子網掩碼:255.255.192.0
19位子網掩碼:255.255.224.0
20位子網掩碼:255.255.240.0
21位子網掩碼:255.255.248.0
22位子網掩碼:255.255.252.0
23位子網掩碼:255.255.254.0
24位子網掩碼:255.255.255.0
25位子網掩碼:255.255.255.128
26位子網掩碼:255.255.255.192
27位子網掩碼:255.255.255.224
28位子網掩碼:255.255.255.240
29位子網掩碼:255.255.255.248
30位子網掩碼:255.255.255.252
31位子網掩碼:255.255.255.254
32位子網掩碼:255.255.255.255