Subnetting question(s)

linuxloverlinuxlover Posts: 228Banned
Hi, I went over a Subnetting section by Chris Bryant ([email protected]) and actually now that I understand it, I feel like this is pretty simple stuff. I have started practising @ subnettingquestions.com and I already have a problem.

Question: What is the first valid host on the subnetwork that the node 172.23.80.9/21 belongs to?
Answer: 172.23.80.1


I don't understand why the answer is 172.23.80.1 and not 172.23.80.10?
grep me, grep you

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