來源：python – Check if two CIDR addresses intersect? – Stack Overflow
可以用 ipaddress 這個模組，這在 python3 是內建的。
import ipaddress
n1 = ipaddress.ip_network('192.168.1.0/24')
n2 = ipaddress.ip_network('192.168.2.0/24')
n3 = ipaddress.ip_network('192.168.2.0/25')
print( n1.overlaps(n2) ) # False
print( n1.overlaps(n3) ) # False
print( n2.overlaps(n3) ) # True
print( n2.overlaps(n1) ) # False