CIDR Tools & Converters

Convert IP address ranges (start-end) into minimal CIDR blocks

Optimize mixed IP addresses, CIDR blocks, and ranges into minimal CIDR prefixes

Split a network into N equal child subnets or to a target prefix length

Find available subnets in pools using first-fit or best-fit algorithms

List unallocated IP blocks in CIDR pools by prefix length

Break CIDR blocks into smaller uniform subnets (e.g., split into /24s)

Compare CIDR lists to show added, removed, and unchanged blocks

Allocate subnets into network pools using first-fit or best-fit algorithms

Check if IP addresses align to CIDR prefix boundaries

Convert between CIDR, subnet masks, and wildcard masks with ACL rule generation