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So i am playing with Cisco CML. I made up a random address 3.0.0.0/8. I wanted to split up that subnet into 4 subnets, So 2^2 = 4. I kinda got confused along the way. In my train of though if we use the formula 2^N on 3.0.0.0/8 that would equal 256 subnets is that Correct ,and Can you use it classful addresses ?

Eric
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  • Classful networking is long dead. It died in 1993 with the introduction of CIDR. Please leave it dead and buried. Subnetting with two bits creates 2^2=4 subnets: 3.0.0.0/10, 3.64.0.0/10, 3.128.0.0/10 and 3.192.0.0/10. But please use one RFC 1918, RFC 5737 or public addresses that you own in your questions. – Zac67 Mar 02 '23 at 09:43
  • 2^8 is 256, so 3.0.0.0/8 is one 256th of the entire IP address space. In you want to split that further, into 4 equal-sized parts, you need an additional 2 bits (since 4=2^2) of prefix, so you'd use /10s (8+2=10). – Gordon Davisson Mar 05 '23 at 21:26

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