192.168.10.0
192.168.11.0
192.168.12.0
192.168.13.0
192.168.14.0
5개니까 8개로 나눈다
0 8 16
192.168.8.0
192.168.248.0
---
192.168.20.0
192.168.21.0
192.168.22.0
192.168.23.0
192.168.24.0
192.168.25.0
0 8 16 24 32
0 16 32
255.255.240.0
192.168.16.0
---
172.175.0.0
172.174.0.0
172.173.0.0
겹치지 않는 최소공배수
