Subnet Calculator
Calculate IPv4 and IPv6 subnets, CIDR notation, and network ranges
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Network Address
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Broadcast / Last Address
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First Usable Host
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Last Usable Host
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Total Addresses
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Usable Hosts
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Subnet Mask
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Wildcard Mask
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How to Use Subnet Calculator
- Enter an IPv4 or IPv6 address and select the CIDR prefix length
- View the calculated network address, host range, and subnet details
- Toggle between IPv4 and IPv6 modes or let the tool auto-detect
Frequently Asked Questions
What is a subnet?
A subnet (subnetwork) divides a larger network into smaller, more manageable segments. Each subnet has its own network address and usable host range.
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation like /24 (IPv4) or /64 (IPv6) represents the number of bits in the network prefix. /24 = 254 usable IPv4 hosts; /64 is the standard IPv6 subnet size.
Does this tool support IPv6?
Yes. Enter any IPv6 address (e.g., 2001:db8::1/48) and the tool will calculate the network prefix, address range, and total addresses for the subnet.