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Possible Duplicate:
How does IPv4 Subnetting Work?

The largest subnet has 300 hosts so I am trying to workout the number of host_id bits I require for the mask but I am confused as each octet goes to 255 max? So do I carry on in the next octet starting from one. This way I have come to the following subnet mask please check it is correct: Subnet Mask: 255.255.192.0

The supernet mask is then straight forward I assume I have used 14 bits for host_id I have 10 subnets on the intranet including leased lines but I did not include the ATM switch as I believe it is just a switch forwarding packets so not separate subnet is that correct?

OK so 10 subnets that means I need 4 bits, so add 4 + 14 host_id bits = 18

32-18 = 14 subnet_id bits, 2^(32-14)= 262144 possible address

So I have Subnet Mask = 255.255.192.0 and Supernet Mask = /14

Is this calculation accurate? I am confused. Thanks

Community
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Jatinder Singh
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1 Answers1

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For your 300-host network, it appears to me that you need 255.255.254.0 or a /23 . That would give you approx 510 IP addresses.

I can't follow the paragraph about the "supernet mask", so I can't answer that question.

hymie
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