1
var validIPAddress = function (queryIP) {
2
  const iPv4 = () => {
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    const address = queryIP.split(".");
4
    if (address.length !== 4) return null;
5

6
    for (const str of address) {
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      const ip = parseInt(str);
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      if (ip < 0 || ip > 255) return null;
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      if (ip.toString() !== str) return null;
10
    }
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    return "IPv4";
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  };
13

14
  const iPv6 = () => {
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    const address = queryIP.split(":");
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    if (address.length !== 8) return null;
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    const config = "0123456789abcdefABCDEF";
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    const check = address.every((str) => {
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      if (str === "" || str.length > 4) return false;
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      for (const s of str) {
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        if (!config.includes(s)) return false;
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      }
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      return true;
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    });
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    return check ? "IPv6" : null;
26
  };
27

28
  return iPv4() ?? iPv6() ?? "Neither";
29
};