v4

@nat.vg · 18d ago · javascript · 51 loc · raw · 0 comments
1/**2 * Extracts /48, /56, and /64 prefixes from an IPv6 address3 * @param {string} ipv6 - The IPv6 address in standard or compressed format4 * @returns {Object} Object containing the /48, /56, and /64 prefixes5 */6function extractIPv6Prefixes(ipv6) {7  // Expand the compressed IPv6 address8  let expandedIPv6 = expandIPv6(ipv6);9  10  // Split the address into groups11  const groups = expandedIPv6.split(':');12  13  // Extract prefixes14  const prefix48 = groups.slice(0, 3).join(':');15  const prefix56 = groups.slice(0, 3).join(':') + ':' + groups[3].substring(0, 1);16  const prefix64 = groups.slice(0, 4).join(':');17  18  return {19    prefix48: prefix48,20    prefix56: prefix56,21    prefix64: prefix64,22    expanded: expandedIPv623  };24}2526/**27 * Expands a compressed IPv6 address to its full form28 * @param {string} ipv6 - The IPv6 address, possibly in compressed format29 * @returns {string} The expanded IPv6 address30 */31function expandIPv6(ipv6) {32  // Handle double colon expansion33  if (ipv6.includes('::')) {34    const parts = ipv6.split('::');35    const left = parts[0] ? parts[0].split(':') : [];36    const right = parts[1] ? parts[1].split(':') : [];37    const missing = 8 - left.length - right.length;38    39    // Create the expanded middle section40    const middle = Array(missing).fill('0000');41    42    // Join all parts together43    const full = [...left, ...middle, ...right];44    45    // Ensure each part is properly padded46    return full.map(part => part.padStart(4, '0')).join(':');47  }48  49  // If no compression, just ensure each part is padded50  return ipv6.split(':').map(part => part.padStart(4, '0')).join(':');51}