The free toolbox that makes DevOps and SRE work easier
Each tool runs in your browser and follows the official docs it links to. No sign-up, no tracking cookies.
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.