IP range ⇔ CIDR
IP range ⇔ CIDR lets you convert IPv4 or IPv6 ranges to and from minimal CIDR sets in your browser.
IP and CIDR comparison
IP and CIDR comparison lets you calculate CIDR containment, overlap, intersection, and directional differences in your browser.
IP and CIDR comparison
⌂ Inputs and results stay in this browser and are not automatically stored or sent.
Waiting for input
Input and conditions
Calculations use your input only; no network queries or configuration changes.
Output
Waiting for input
Complete text result
How to use
Enter two IP/CIDR values to inspect containment, intersection, and directional differences.
Swapping inputs changes what the difference means. Before applying a network rule, distinguish full containment from partial overlap and check that access is not unintentionally expanded.
Examples
192.0.2.0/24
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192.0.2.128/25Principles and limits
Each input is limited to 1,048,576 bytes, output to 33,554,432 bytes, and processing to 5,000 ms. Input is never silently truncated.
Guides
Related tools
CIDR aggregation
CIDR aggregation lets you deduplicate and minimally aggregate CIDRs without widening their union in your browser.