IPv4 reserved addresses

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Soldato
Joined
1 Jun 2005
Posts
5,152
Location
Kent
I have to write a report for an OU assignment that covers a bit about IPv4, IPv6 and any issues with the move over from one to the other. What i would like to include in my report is the number of IPs usable that are not reserved.

What i need help with is just confirmation that i am calculating the number of reserved addresses correctly. wikipedia lists the reserved addresses and the way im currently working out the number of reserved ip from the addresses listed like 0.0.0.0/8 10.0.0.0/8 14.0.0.0/8 127.0.0.0/8 etc... is 2^h where h is the host bits, so for instance there are 4 reserved IPs that use the /8 subnet, so i would do 2^24 + 2^24 + 2^24 + 2^24, then for the /16's i would add 2^16 etc...

Is the the correct way of calculating the total number of reserved IP addresses?

Also, out of the non-reserved pool of IPs, is there any way i can find out how many of the IPs are usable and how many are network/broadcast IPs?
 
10.0.0.0/8
172.16.0.0/12
192.168.0.0/16

Num of useable subnets: 2^n - 2 (n = num of bits borrowed)
valid host IP addresses per subnet: use 2^n -2 (n = num of bits not borrowed)
 
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