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IP Subnet Calculator

Calculate IPv4 or IPv6 subnet details from an IP address and subnet mask or CIDR prefix.

Calculate IPv4 or IPv6 subnet details from an IP address and subnet mask or CIDR prefix. Use it for network planning, address allocation and learning CIDR/subnetting. Double-check production network changes and remember that routing, VLAN and firewall design involve more than the calculated address range.

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