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Table 12. CIDR subnet mask information
Subnet Mask
CIDR Equivalent
255.255.255.255
/32
255.255.255.254
/31
255.255.255.252
/30
255.255.255.248
/29
255.255.255.240
/28
255.255.255.224
/27
255.255.255.192
/26
255.255.255.128
/25
255.255.255.0
/24
255.255.254.0
/23
255.255.252.0
/22
255.255.248.0
/21
255.255.240.0
/20
255.255.224.0
/19
255.255.192.0
/18
255.255.128.0
/17
255.255.0.0
/16
255.254.0.0
/15
255.252.0.0
/14
255.248.0.0
/13
255.240.0.0
/12
255.224.0.0
/11
255.192.0.0
/10
255.128.0.0
/9
255.0.0.0
/8
254.0.0.0
/7
254.0.0.0
/6
252.0.0.0
/5
248.0.0.0
/4
224.0.0.0
/3
192.0.0.0
/2
128.0.0.0
/1
0.0.0.0
/0
Note
Host (single address)
Unusable
2 usable
6 usable
14 usable
30 usable
62 usable
126 usable
Class C 254 usable
2 Class Cs
4 Class Cs
8 Class Cs
16 Class Cs
32 Class Cs
64 Class Cs
128 Class Cs
Class B
2 Class Bs
4 Class Bs
8 Class Bs
16 Class Bs
32 Class Bs
64 Class Bs
128 Class Bs
Class A
2 Class As
4 Class As
2 Class As
8 Class As
16 Class As
32 Class As
64 Class As
IP space
Chapter 3. Configuring the system
49
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