Table 7. Analysis of 256 Values of Last Byte

Last Byte What Why
Addresses Happens  
  to Them  
0 invalid first subnet address
1-30 valid hosts on first subnet
31 invalid broadcast address of first subnet
32 invalid second subnet address
33-62 valid hosts for second subnet
63 invalid broadcast address of second subnet
64 invalid third subnet address
65-94 valid hosts for third subnet
95 invalid broadcast address of third subnet
96 invalid fourth subnet address
97-126 valid hosts for fourth subnet
127 invalid broadcast address of fourth subnet
128 invalid fifth subnet address
129-158 valid hosts for fifth subnet
159 invalid broadcast address of fifth subnet
160 invalid sixth subnet address
161-190 valid hosts for sixth subnet
191 invalid broadcast address of sixth subnet
192 invalid seventh subnet address
193-222 valid hosts for seventh subnet
223 invalid broadcast address of seventh subnet
224 invalid eighth subnet address
225-254 valid hosts for eighth subnet
255 invalid broadcast for eighth subnet