andremarcondesteixeira

:root {
  --space-unit: 1rem;
  --space-xxs: calc(0.25 * var(--space-unit));
  --space-xs: calc(0.5 * var(--space-unit));
  --space-sm: calc(0.75 * var(--space-unit));
  --space-md: calc(1.25 * var(--space-unit));
  --space-lg: calc(2 * var(--space-unit));
  --space-xl: calc(3.25 * var(--space-unit));
  --space-xxl: calc(5.25 * var(--space-unit));
}

andremarcondesteixeira

export function calculateIpv4Subnet(ipAddress, subnetMask) {
    // helper functions
    const numbersArrayFromString = v => v.split('.').map(v => parseInt(v));
    const numberBinaryAsString = v => (v >>> 0).toString(2).padStart(8, '0');
    const addressBinaryAsString = v => numbersArrayFromString(v).map(numberBinaryAsString).join('');
    const addressAsNumber = v => parseInt(addressBinaryAsString(v), 2);
    const addressStringFromNumber = v => [24, 16, 8, 0].map(shift => (v >>> shift) & 255).join('.');

    ipAddressNumber = addressAsNumber(ipAddress);
    subnetMaskNumber = addressAsNumber(subnetMask);

andremarcondesteixeira

^(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)(?:\.(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]\d|\d)){3}$