Free, fast calculators for DevOps and cloud engineers
Small, focused tools for the questions you look up every week: subnet math, pod sizing, cron schedules.
- Runs in your browser
- No sign-up, no tracking cookies
- Based on official docs
Networking
CIDR calculator
IP range, subnet mask and usable IPs on AWS, Azure and GCP for any CIDR.
Terraform cidrsubnet calculator
Evaluate cidrsubnet() and plan VPC subnets, with copy-ready HCL.
AWS VPC subnet planner
Plan per-AZ subnets by tier with room to grow, plus Terraform.
VPC peering CIDR overlap checker
Find overlapping CIDR blocks between VPCs before you peer them.