A modern, interactive IPv4 subnet calculator built for learners and pentesters. This web app calculates network addresses, broadcast addresses, usable host range, block size, and more, while explaining each step so you understand why the calculations work.
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Input any IPv4 address with CIDR notation (e.g.,
10.10.12.13/29). -
Calculates:
- Network address (first IP)
- Broadcast address (last IP)
- Total IPs and usable host IPs
- Host IP by number (e.g., 3rd host)
- Which octets change in the subnet
- Block size and last-octet multiples
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Provides detailed explanation of each step:
- 32-bit reasoning
- Network vs host bits
- Subnet math using powers of 2
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Optional host number input to find any specific IP in the subnet.
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Quick facts chips for easy reference.
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Toggle binary view for network and broadcast addresses.
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Copy results to clipboard.
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Example fill button for quick testing.
Aryan Giri