Subnet Masks.


This is for personal use.






Bits
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Subnetwork Mask
255.255.0.0
255.255.128.0
255.255.192.0
255.255.224.0
255.255.240.0
255.255.248.0
255.255.252.0
255.255.254.0
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.240
255.255.255.248
255.255.255.252
255.255.255.254
255.255.255.255
16 bits
1
-
2
6
14
30
62
126
254
510
1022
2046
4094
8190
16382
32766
65534
20 bits
-
-
-
-
1
-
2
6
14
30
62
126
254
510
1022
2046
4094
24 bits
-
-
-
-
-
-
-
-
1
-
2
6
14
30
62
126
254
Effective # of Hosts.
65534
32766
16382
8190
4094
2046
1022
510
254
126
62
30
14
6
2
-
-