Paste an IPv4 CIDR list to find every overlap, distinguish duplicate subnets from containment, normalize host-bit entries, and count the unique addresses covered.
ROUTE TABLE AUDIT · LOCAL IPv4 ANALYSIS · BROWSER WORKSPACE
Find every overlap. See containment and duplicate rules clearly.
Paste an IPv4 CIDR list to find every overlap, distinguish duplicate subnets from containment, normalize host-bit entries, and count the unique addresses covered.
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01 · ROUTE TABLE INPUTONE IPv4 BLOCK PER LINE
Host addresses are normalizedFor example, 10.1.2.3/24 is treated as 10.1.2.0/24. Blank lines are ignored; malformed nonblank lines are reported with their line number.
How routing resolves overlapThe more specific prefix wins by longest-prefix match. Containment can be intentional; duplicates and unexpected subnets deserve a review.
2 overlapping pairs. Overlap is normal in routing; review the pair details to check each one is deliberate.
OVERLAPPING PAIRS2 PAIRS
CONTAINED · PAIR 0110.1.0.0/16 is inside 10.0.0.0/8The narrower prefix wins by longest-prefix match. Confirm that this override is intended.CONTAINED · PAIR 02172.20.0.0/14 is inside 172.16.0.0/12The narrower prefix wins by longest-prefix match. Confirm that this override is intended.
Runs in this browser. IPv4 CIDR blocks are parsed and compared locally. Host addresses are normalized to their network boundary; overlapping routes can be intentional, so review each pair in context.
Paste an IPv4 CIDR list to find every overlap, distinguish duplicate subnets from containment, normalize host-bit entries, and count the unique addresses covered. Results update as you adjust inputs and stay in this browser.
