IBM 2073-700, Quick Installation Manual

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