IP 重叠检查

Overlapping networks cause some of the most confusing faults in practice: two VPN sites that both use 10.0.0.0/16, a cloud subnet that collides with an office LAN, or a firewall rule that silently shadows another.

Paste your networks one per line. CIDR blocks can only nest or be disjoint, so every overlap the tool reports is one of two kinds: the same block listed twice, or one block containing another. The check runs in your browser in a single pass, so lists of several thousand blocks are fine.

The merged list is the smallest set of CIDR blocks that covers exactly the same addresses: duplicates and contained blocks disappear and adjacent blocks are joined where they line up (10.0.0.0/25 and 10.0.0.128/25 become 10.0.0.0/24). It is the list you would put in a route filter or an allowlist.