“Class A” / IP Address Allocation

25 pts.
Tags:
IP
IP address
IP Address Allocation
IPv6
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.

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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.

Discuss This Question: 3  Replies

 
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  • Labnuke99
    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.
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  • Ali312money
    In introduced Article by you in diagram it is said that Class A Number of Networks is 128. BUT I think it is 126. ???
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  • Ali312money
    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.
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