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Classless Inter-Domain Routing
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Class Inter-Domain Routing
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Classless Inter-Domain Racking
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Drinking apple CIDR with a kick before starting
EXPLANATION
Classless Inter Domain Routing (CIDR) is a method for assigning IP
addresses without using the standard IP address classes like Class A,
Class B or Class C. CIDR is a newer addressing scheme for IP Networks
which
allows for a more efficient allocation of IP addresses than the older
method which was by assigning organizations a class of IPs. CIDR was a
result of running out of IPv4 addresses as well as addressing the issue
with
routing tables increasing in size.
There is a maximum number of networks and hosts that can be assigned
unique IP addresses using the 32 bit addressing. Traditionally, the
Internet assigned "classes" of addresses: Class A, Class B and Class C
were the
most common. Many large organizations were assigned Class A blocks.
Others were assigned Class B blocks. The smaller organizations were
assigned Class C blocks. Not all organizations used all of the IP
addresses within
the block they were assigned. This resulted in an inefficent use of the
addressing scheme. For this reason, the Internet was, until the arrival
of CIDR, running out of address space very quickly. CIDR effectively
solved
the problem by providing a new and more flexible way to specify network
addresses.
| Class | Network Bits | Host Bits | Decimal Range |
|---|
| Class A | 8 | 24 | 1-126 |
| Class B | 16 | 16 | 128-191 |
| Class C | 24 | 8 | 192-223 |
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