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I was reading about IP address classification recently and I have a doubt regarding it.

The range for class C IP addresses is 192.0.0.x-223.255.255.x.

So whenever I buy a new router,the IP for router configuration is something like 192.168.x.x

My Question is that,does the company which manufactures the router has to pay for using Class C addresses?

or If I were to manufacture the routers myself,will I be allowed to use the Class C IP range for hosts.

Can I create a router with Class A IP addressing ?.

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  • Classes are dead, killed in 1993 by RFCs 1517, 1518, and 1519, which defined CIDR (Classless Inter-Domain Routing). Modern networking does not use network classes. Please let them rest in peace. Routers do not have any particular IP address range. A routers interface networks are what you configure on them. – Ron Maupin Jan 31 '18 at 15:07
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Forget about classes. They were overruled by CIDR (Classless Inter-Domain Routing) in 1993.

The router vendors usually put the address of the device in the range 192.168.X.X

It is configured in that way because there are three ranges defined in RFC 1918 for private use:

10.0.0.0 – 10.255.255.255

172.16.0.0 – 172.31.255.255

192.168.0.0 – 192.168.255.255

Anyone is free to use any address of these ranges in their private network as long as it remains private.

Your home router uses NAT to avoid exposing your private addresses to the public internet, but yet be able to connect to internet.

The following image from a web site that explains NAT may help you to understand the concept.

enter image description here

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There is a set of network addresses that are known as private addresses 192.168.x.x is one of them.

The Private address space is:

10.0.0.0 – 10.255.255.255- Class A

172.16.0.0 – 172.31.255.255 Class B

192.168.0.0 – 192.168.255.255 Class C

These addresses can be used in a private network, nobody pays for these addresses.

Yes , you can create a class A private address in the range of

10.0.0.0 – 10.255.255.255

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  • Network classes were deprecated in 1993, probably before you were born, and a couple of years before the Internet went commercial. Please forget about network classes because they are not used, and they simply confuse. – Ron Maupin Jan 31 '18 at 15:11

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