IP Subnet Calculator
Calculation
Subnet details
Classification
Representations
Calculate IPv4 and IPv6 subnet boundaries, capacity, masks, adjacent networks, and subdivisions. Everything is calculated in your browser. Enter an IP address, CIDR subnet, address range, IPv4 mask, or host requirement to start.
Specialized subnet calculators
Apply cloud reservations, managed-service rules, or container-platform sizing on a dedicated calculator page.
AWS Subnet Calculator
Apply VPC and BYOIP reservations, plus sizing for EKS VPC CNI, ECS/Fargate, and AWS networking services.
Azure Subnet Calculator
Apply VNet and custom public prefix rules, plus sizing for AKS, Container Apps, and Azure networking services.
Google Cloud Subnet Calculator
Apply VPC primary, secondary, IPv6, and BYOIP rules, plus sizing guidance for proxy-only subnets, Private Service Connect, and GKE.
Oracle Cloud (OCI) Subnet Calculator
Apply VCN and BYOIP rules, plus sizing guidance for Bastion, Load Balancer, Network Firewall, and Oracle Kubernetes Engine.
Kubernetes Subnet Calculator
Size node subnets, per-node Pod CIDR blocks, and Service CIDRs while checking capacity and overlap guidance.
Docker Subnet Calculator
Size bridge networks, Engine address pools, and Swarm overlay pools by container or network count.
Accepted input formats
CIDR and addresses
Masks and host counts
Ranges and subdivisions