Node.js version (not finished yet)

utils/isLocalIP.js

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+const ipaddr = require('ipaddr.js');
+
+module.exports = ip => {
+	const range = ipaddr.parse(ip).range();
+	return [
+		'unspecified', 'multicast', 'linkLocal', 'loopback', 'reserved', 'benchmarking',
+		'amt', 'broadcast', 'carrierGradeNat', 'private', 'as112', 'uniqueLocal',
+		'ipv4Mapped', 'rfc6145', '6to4', 'teredo', 'as112v6', 'orchid2', 'droneRemoteIdProtocolEntityTags',
+	].includes(range);
+};