04 — Networking Suite
CIDR & Subnet Planner
Input an IPv4 address block to parse its metrics, calculate network bounds, and simulate VPC subnet divisions. Runs 100% locally in your browser — zero tracking.
Understanding CIDR Notation
CIDR (Classless Inter-Domain Routing) notation represents an IP address and its associated routing prefix. For example, in 10.0.0.0/16, the /16 represents the prefix length (the number of leading 1-bits in the subnet mask). A /16 mask translates to 255.255.0.0, allowing up to 65,536 total IP addresses.
RFC 1918 Private Ranges
When designing Virtual Private Clouds (VPCs) on AWS, GCP, or Azure, stick to private RFC 1918 namespaces to avoid overlaps with the public web:
10.0.0.0/8(Large corporate networks)172.16.0.0/12(Medium networks)192.168.0.0/16(Home/small branch networks)
Always plan for subnets that leave room for future growth, Kubernetes cluster namespaces (pod/service IPs), and database host groups.