“Class A” / IP Address Allocation
I am confused with a lot of references that have different saids about Class A.
Is 127.0.0.1 one of the Class A members?
(I know that it is useless somehow)
and number of nets is 126 or 128?
Thanks in advance.
Software/Hardware used:
ASKED:
February 9, 2010 7:39 PM
UPDATED:
February 9, 2011 11:52 PM
Answer Wiki:
Class A - 0.0.0.0 - 127.255.255.255
Class B - 128.0.0.0 - 191.255.255.255
Class C - 192.0.0.0 - 223.255.255.255
These are the correct numbers. The loopback address falls into the class A section, but it is reserved in IP. The range is 127.0.0.0 - 127.255.255.255
**************
Class A - 10.0.0.0 - 10.255.255.255
Class B - 172.16.0.0 - 172.31.255.255
Class C - 192.168.0.0 -192.168.255.255
127.0.0.1 is not a member of class A and any other class. It is your NIC's loopback. So, no matter what happen, even if your not in any other network you can still ping 127.0.0.1.
about the subnets, just refer to the power of 2's.
for your question, its 128 (1,2,4,8,16,32,64,128,256).
126 is the number of usable ip address in that subnet.
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127.0.0.1 is one of those special or reserved IP addresses. It always refers to loopback on the localhost. If you are going into networking, you should be familiar with special/reserved IP addresses.
In introduced Article by you in diagram it is said that Class A Number
of Networks is 128. BUT I think it is 126.
???
See
http://superuser.com/questions/31824/why-is-localhost-ip-127-0-0-1
I this papar something different is said.
it says 127.0.0.1 is class A.
Wow.
Please cite another refernced for your claim.
thanks.