Free tool · IP & Subnetting
IP-in-Subnet & Overlap
Is an IP in a subnet? Do two subnets overlap? Answered instantly.
Is an IP inside a subnet?
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10.20.30.40 is inside 10.20.0.0/16
range 10.20.0.0 – 10.20.255.255
Do two subnets overlap?
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First contains second
A 10.0.0.0 – 10.0.255.255 · B 10.0.5.0 – 10.0.5.255
About this tool
Free IP-in-subnet and subnet overlap checker. Instantly see whether an IP address falls within a given CIDR network, and whether two subnets overlap, are disjoint, or one contains the other — for fast ACL, routing and firewall troubleshooting. Everything runs entirely in your browser — nothing you type is sent to a server.
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