IPV4 ENGINEERING UTILITY
Subnet, CIDR & VLSM
Address planning and network checks. Calculated locally, without sending your network data anywhere.
Subnet Calculator
Calculate an IPv4 network from any address and CIDR prefix.
Enter your inputs and calculate to see results. All calculations stay in your browser.
CIDR / Mask Converter
Convert a prefix or a contiguous subnet mask. Wildcard masks are shown in the result.
Enter your inputs and calculate to see results. All calculations stay in your browser.
Subnet Splitter
Divide a parent network into equal-size subnets at a longer prefix.
Enter your inputs and calculate to see results. All calculations stay in your browser.
Hosts to CIDR
Find the smallest address block that supports the required host count.
Enter your inputs and calculate to see results. All calculations stay in your browser.
Required Subnets Calculator
Find the shortest new prefix that provides at least the requested number of equal-size subnets.
Enter your inputs and calculate to see results. All calculations stay in your browser.
VLSM Planner
Allocate named subnets within a parent network, largest requirement first.
Enter your inputs and calculate to see results. All calculations stay in your browser.
Same Subnet Checker
Compare the calculated networks for two IPv4 addresses under one prefix or mask.
Enter your inputs and calculate to see results. All calculations stay in your browser.
Network Overlap Checker
Compare normalized CIDR ranges for overlap and full containment.
Enter your inputs and calculate to see results. All calculations stay in your browser.