I'm trying to break down a /16 into multiple subnets. I would like to use a /23 for our physical servers for the first range (172.26.0.1-172.26.1.254) and a /20 next (172.26.2.1-172.26.17.254). Is this possible? Every time I use a subnet calculator, it keeps telling me my network will be 172.26.0.0. Why can I not start with .2 in the third octet? I went further and tried with 172.26.18.1 and it says my network will be 172.26.16.0. Can someone explain why this is? Thanks.
Edit: My first range is a /23 not /21
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