Cloud networking toolkit
Modern subnet tools built for speed, accuracy, and repeat visits
SubnetTool helps platform teams move from rough IP estimates to deployment-ready plans. Calculate cloud-aware usable IPs, plan AKS, ARO, EKS, and GKE subnet sizing correctly, and validate CIDR ranges before production rollout.
Tool directory
Focused subnet and CIDR utilities built for real cloud deployments, including Azure, AWS, Google Cloud, AKS, OpenShift, EKS, and GKE environments.
Planning Kubernetes networking or choosing between providers? Compare networking models across AKS, EKS, GKE, and ARO before sizing production subnets.
Subnet planning
Usable IP Calculator (Cloud-aware)
Calculate realistic usable IPs in Azure, AWS, GCP, or classic networking mode.
Open cloud subnet calculator →Subnet planning
CIDR to IP Range Calculator
Convert CIDR notation into full subnet details for firewall validation and IP planning.
Open CIDR range calculator →Subnet planning
Subnet Calculator
Split a network by number of subnets or hosts per subnet and view network, broadcast, and usable IP ranges.
Open subnet calculator →Subnet planning
Cloud Kubernetes Subnet Planner
Compare cloud-aware node subnet and pod range sizing across AKS, ARO, EKS, and GKE before you deploy.
Open cloud Kubernetes planner →Kubernetes – CIDR sizing
Kubernetes Pod CIDR Calculator
Start with provider-neutral pod, node, and service CIDR sizing for vanilla Kubernetes and common networking models.
Open pod CIDR calculator →Kubernetes – Azure
AKS Subnet Calculator
Plan Azure Kubernetes Service subnet and pod CIDR sizing for Azure CNI, Overlay, and Kubenet.
Open AKS subnet calculator →Kubernetes – Azure
ARO Subnet Calculator
Size master, worker, and pod CIDR ranges for Azure Red Hat OpenShift deployments.
Open ARO subnet calculator →Kubernetes – AWS
EKS Subnet Calculator
Plan Amazon EKS subnet CIDR sizing for AWS VPC CNI (pods + nodes share VPC subnet IPs).
Open EKS subnet calculator →Kubernetes – Google Cloud
GKE Subnet Calculator
Plan GKE VPC-native subnet sizing: primary node subnet + secondary pod and service ranges.
Open GKE subnet calculator →Encoding tools
Base64 Encode & Decode Tool
Encode and decode Base64 locally in your browser with privacy-first defaults.
Open Base64 tool →Continue learning after each calculation
Use these concise guides to avoid cloud-specific subnet mistakes and speed up architecture reviews.
- Compare Kubernetes networking models (AKS vs EKS vs GKE vs ARO) before you choose defaults.
- Understand AKS networking (flat vs overlay vs kubenet) to avoid Azure CNI IP exhaustion.
- Learn how EKS networking works (ENI + VPC CNI) to prevent subnet IP exhaustion and scaling ceilings.
- Understand GKE alias IPs and secondary ranges to size pod and service CIDRs correctly.
- Learn ARO subnet + OpenShift CIDR planning to size worker subnets and overlay ranges safely.
- Read Azure subnet reservation rules for production VNet planning.
- Understand AWS subnet reserved IPs before sizing private and public ranges.
- Check Google Cloud subnet reservations to avoid host-count surprises.
- Review Base64 practical guidance for safer app and API workflows.
Frequently asked questions
Why does usable IP count differ between cloud providers?
Cloud platforms reserve a fixed set of addresses inside each subnet for infrastructure services, so usable host counts are always lower than textbook subnetting.
Can I use this for quick architecture validation?
Yes. The calculators are designed for rapid checks during design reviews, migration planning, and troubleshooting sessions.
How can I keep coming back to the right tools quickly?
Bookmark the tools page for day-to-day use and keep the learn section open for provider-specific subnet rules and Kubernetes networking deep dives.