Network & Infrastructure utility
Subnet Calculator
Divide an IPv4 network into equal-sized subnets with a target prefix.
● This tool runs entirely in your browser. Your input is never uploaded to our servers.
Output
Your result will appear here…
How to use Subnet Calculator
- Enter a base network and target prefix, such as 10.0.0.0/24 /26.
- Select Calculate to list resulting subnets and address counts.
- Use a target prefix equal to or longer than the base prefix.
Example
Input:
10.0.0.0/24 /26
Output:
10.0.0.0/26 10.0.0.63 64 addresses 10.0.0.64/26 10.0.0.127 64 addresses
Use cases
- Plan equal subnet blocks from a parent network.
- Check subnet boundaries before configuring routers.
- Compare prefix choices for a private IPv4 range.
About this tool
Divide an IPv4 network into equal-sized subnets with a target prefix. Processing happens locally in your browser, so your input is not sent to a server or included in analytics.
Frequently asked questions
How many subnet rows are shown?
At most 256 are listed to keep output manageable.
Can I make larger subnets than the source?
No. The target prefix must be equal to or longer than the source prefix.
Does this query a router or DNS?
No. It performs a local calculation only.