~/netref / CIDR Overlap Checker
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CIDR Overlap / Conflict Checker

Paste a list of CIDRs to catch address-space conflicts before they bite — VPC peering, site-to-site VPN, or a network merge. Each pair is classified disjoint / identical / contains, with an address-space ruler drawn to scale.

CIDRs (comma or newline separated)
⚠ 1 overlapping pair — these blocks conflict.
// address-space ruler
10.0.0.0/16
10.0.1.0/24
10.1.0.0/24
192.168.0.0/24
Block ABlock BRelation
10.0.0.0/1610.0.1.0/24⚠ 10.0.0.0/16 contains 10.0.1.0/24
10.0.0.0/1610.1.0.0/24disjoint
10.0.0.0/16192.168.0.0/24disjoint
10.0.1.0/2410.1.0.0/24disjoint
10.0.1.0/24192.168.0.0/24disjoint
10.1.0.0/24192.168.0.0/24disjoint