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Taking the example of 10.0.0.0/20, that means my range is 10.0.0.0 to 10.0.15.255
I got that range because I know that the wild card is 0.0.15.255 and I just add it with the beginning address 10.0.0.0

Now, in the case of 198.51.100.223/21, I have a wildcard/ host mask of 0.0.7.255. How do I use this host mask to get my range? The first address is 198.51.100.223. Do I just add each of them up? The last octet now goes beyond 255 which is wrong. How does this have a range of 192.51.96.0 to 192.51.103.254 ?

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