IP range → subnets
Calculation happens locally in the browser.
Enter an IP and mask or the first and last IP addresses.
0 = exact aggregation only, no extra IPs.
Optimized CIDR list will appear here.
Paste one CIDR subnet per line.
One route per line. CIDR ↔ Windows route.
Converted routes will appear here.
Paste Windows route commands or CIDR routes.
Supports single ports, comma lists, and ranges up to 100 total ports.
Unified IPv4 subnet calculator, subnet aggregator, and route converter in one local-only workspace.