39 lines
1.4 KiB
Text
39 lines
1.4 KiB
Text
[
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{
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"name": "Network Address from Host IP",
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"description": r"""Calculates the network address from a host IP/MASK notation.
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Given a host IP address and subnet mask in CIDR notation (e.g., 192.168.1.100/24),
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this formula extracts the network address (e.g., 192.168.1.0/24).
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Where:
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- Host IP/MASK: IP address with CIDR subnet mask (e.g., 192.168.1.100/24)
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- Network: The resulting network address in IP/MASK format (e.g., 192.168.1.0/24)
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The network address is calculated by applying the subnet mask to zero out the host bits.""",
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"input": [
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{"name": "hostIP", "unit": "string"}
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],
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"output": {"name": "network", "unit": "string"},
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"d4rtCode": r"""
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var parts = hostIP.split('/');
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var ip = parts[0];
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var mask = int.parse(parts[1]);
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var octets = ip.split('.').map((e) => int.parse(e)).toList();
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var hostBits = 32 - mask;
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var shiftAmount = hostBits;
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var networkValue = 0;
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for (var i = 0; i < 4; i++) {
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networkValue = (networkValue << 8) | octets[i];
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}
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networkValue = (networkValue >> shiftAmount) << shiftAmount;
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var networkOctets = [];
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for (var i = 0; i < 4; i++) {
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networkOctets.insert(0, networkValue & 0xFF);
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networkValue = networkValue >> 8;
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}
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network = networkOctets.join('.') + '/' + mask.toString();
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""",
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"tags": ["networking", "ip", "subnetting", "cidr", "network"]
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}
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]
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