Drill right-sizing subnets: pick the smallest prefix that fits the required hosts.
A subnet must fit 423 hosts. Smallest prefix that works?
A /N prefix has 2^(32-N) − 2 usable hosts. Pick the largest N (smallest block) that still fits.
Need 50 hosts → /26 (62 usable)Host-count requirements from 5 to 500 hosts and the smallest working prefix.
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