Handy utilities for engineering.
Examples: 10.0.0.0/8, 172.16.5.4/20, 192.168.1.1/30
10.0.0.0/8
172.16.5.4/20
192.168.1.1/30
Fields: minute hour day-of-month month day-of-week
minute
hour
day-of-month
month
day-of-week