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IP Class/Classless - Subnet mask quick reference chart
Subnet Mask
Max Hosts
Mathmatics
Host bit length
Mask octet
Binary
Mask Length
Subnet Length
255.255.255.255
1
2 ^ 0 =
0
4
11111111
32
0
255.255.255.254
2
2 ^ 0 =
1
4
11111110
31
1
255.255.255.252
4
2 ^ 0 =
2
4
11111100
30
2
255.255.255.248
8
2 ^ 0 =
3
4
11111000
29
3
255.255.255.240
16
2 ^ 0 =
4
4
11110000
28
4
255.255.255.224
32
2 ^ 0 =
5
4
11100000
27
5
255.255.255.192
64
2 ^ 0 =
6
4
11000000
26
6
255.255.255.128
128
2 ^ 0 =
7
4
10000000
25
7
255.255.255.0
256
2 ^ 0 =
8
3
11111111
24
8
255.255.254.0
512
2 ^ 0 =
9
3
11111110
23
9
255.255.252.0
1024
2 ^ 0 =
10
3
11111100
22
10
255.255.248.0
2048
2 ^ 0 =
11
3
11111000
21
11
255.255.240.0
4096
2 ^ 0 =
12
3
11110000
20
12
255.255.224.0
8192
2 ^ 0 =
13
3
11100000
19
13
255.255.192.0
16384
2 ^ 0 =
14
3
11000000
18
14
255.255.128.0
32768
2 ^ 0 =
15
3
10000000
17
15
255.255.0.0
65536
2 ^ 0 =
16
2
11111111
16
16
255.254.0.0
131072
2 ^ 0 =
17
2
11111110
15
17
255.252.0.0
262144
2 ^ 0 =
18
2
11111100
14
18
255.248.0.0
524288
2 ^ 0 =
19
2
11111000
13
19
255.240.0.0
1048576
2 ^ 0 =
20
2
11110000
12
20
255.224.0.0
2097152
2 ^ 0 =
21
2
11100000
11
21
255.192.0.0
4194304
2 ^ 0 =
22
2
11000000
10
22
255.128.0.0
8388608
2 ^ 0 =
23
2
10000000
9
23
255.0.0.0
16777216
2 ^ 0 =
24
1
11111111
8
24
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