How can you identify the IP class of a given IP Address?
Class A networks, start from 18.104.22.168 to 22.214.171.124.
Class B network addresses start from 126.96.36.199 to 188.8.131.52.
Class C network addresses start from 192.0.0.0 to 184.108.40.206.
Hope that helps
So, You check the range in which the network address you are checking fits, and then you will know what class it is.
If I may add some additional information to help clarify the thread...
What actually determines an IP's class in a classful network is actually the IP addresses's leading bits.
All Class A addresses will have first leading bit as zero (0). So, actually Class A's range is:
0.0.0.0 - 127.255.255.255.
What I mean by the leading bit is, if you convert the decimal value to binary for the first octect, you have 8 places. A Class A address must have a 0 in the first bit. In binary the range is:
00000000 - 01111111 which in Base 10 --> 0 - 127. We know that 127.0.0.1 is the loopback address, but it is still classified in the Class A range.
A Class B address, the first and second leading bit must be a '10' in binary. So for example, the range is: 10000000 - 10111111 which equals in Base 10 --> 128 - 191.
A Class C address, the first, second, and third bit must be '110' in binary. So for example, the range is: 11000000 - 11011111 which equals in Base 10 --> 192 - 223.
So, in summary, here are the Classes of A-C:
Class A 0.0.0.0 127.255.255.255
Class B 220.127.116.11 18.104.22.168
Class C 192.0.0.0 22.214.171.124
If you are interested in Class D and E, just continue with the pattern of leading bits.
Class D --> '1110'
Class E --> '1111'
Well done Jorge.
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