CIDR Calc

Subnet Collision Scanner

Paste multiple CIDRs and instantly find overlapping networks that cause VPN, routing, or firewall conflicts.

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Results

Overlap report

Scanned

4 subnets

Overlap

10.0.0.0/8 ↔ 10.10.0.0/16

10.0.0.0 – 10.255.255.255

Overlap

192.168.1.0/24 ↔ 192.168.1.128/25

192.168.1.0 – 192.168.1.255