Check whether two IPv4 CIDR blocks overlap and show their address ranges.
Overlap
-
First range
-
Second range
-
Enter the example value or paste your own input, choose the mode when one is available, and read the first result card for the direct answer. The output area gives a copyable block for code reviews, documentation, API tests, classwork or troubleshooting notes.
What the result means
The calculator converts both CIDR blocks to integer start and end addresses, then checks whether the ranges intersect.
What is not included
Only IPv4 CIDR is supported. It does not inspect live network routing tables.
Privacy note
The calculation runs in your browser. Avoid pasting production secrets, credentials, private keys, customer data or regulated personal data unless your own policy allows browser-based tools.