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There are three Classes of IP Ranges:
Class A: 0.0.0.0 - 127.255.255.255 with subnet mask 255.0.0.0
Class B: 128.0.0.0 - 191.255.255.255 with subnet mask 255.255.0.0
Class C: 192.0.0.0 - 123.255.255.255 with subnet mask 255.255.255.0

Within Class A the private IP range is:
10.0.0.0 - 10.255.255.255 with subnet mask 255.0.0.0

Within Class B the private IP range is:
172.16.0.0 - 172.16.255.255 with subnet mask 255.255.0.0

Within Class C the private IP range is:
192.168.0.0 - 192.168.255.255 with subnet mask 25.255.255.0

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Posted by jahangir1983

10.0.0.0 (A)
172.16.0.0 (B)
192.168.0.0 (C)

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Posted by Hash007

10.0.0.0 - - 10.255.255.255
172.16.0.0 - - 172.31.255.255
192.168.0.0 - - 192.168.255.255

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Posted by waqqas1

Note:For class B in 2nd octet its 16 not 160

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Posted by sagitraz

There are basically 3 private address ranges.

For Class A
10.0.0.0

For Class B
172.160.0.

For Class C
192.168.0.0

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Posted by sagitraz