Networking & scheduling tools
The things you end up looking up on some ad-filled site instead.
VPC Subnet & CIDR Calculator
How many hosts, and does it overlap?
Work out network, broadcast, netmask and usable hosts for any IPv4 CIDR, with the AWS host count that is five lower than the standard one.
Cron Expression Explainer
What it means, and when it next runs
Turn a cron expression into a sentence with its next six run times, and catch the trap: day-of-month and day-of-week are ORed, not ANDed.
VPC Subnet Planner
Lay out the whole VPC at once
Lay out every subnet in an AWS VPC at once, with the five addresses AWS reserves per subnet already taken off the usable count.
Cron Expression Generator
Pick a schedule, get the expression
Build a cron expression from a form, optionally wrapped in a complete Kubernetes CronJob with hardened defaults.