🌐 Networking & Telecommunications

VLSM Calculator

Allocate variable-length IPv4 subnets from a base network for multiple host requirements.

Free toolClient-sideNo account required
Result
Enter values and select Calculate.
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How to use this calculator

What to enter

Enter or select the following as requested: Base network CIDR; Host requirements (one per line). Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The network result is calculated from addressing, packet, throughput, latency, power, or capacity parameters entered. Check the network protocol, subnet mask/prefix, MTU, link rate, and whether the estimate includes headers, retransmissions, interference, and other real-world overhead.

When to use it

Use this to plan or troubleshoot network addressing, performance, and capacity. Validate configuration changes in the target environment and follow your organization’s network and security policies.