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test/parallel/test-internal-net-isLoopback.js

@@ -0,0 +1,32 @@
+// Flags: --expose-internals
+'use strict';
+require('../common');
+const assert = require('assert');
+const net = require('internal/net');
+
+const loopback = [
+  'localhost',
+  '127.0.0.1',
+  '127.0.0.255',
+  '127.1.2.3',
+  '[::1]',
+  '[0:0:0:0:0:0:0:1]',
+];
+
+const loopbackNot = [
+  'example.com',
+  '192.168.1.1',
+  '10.0.0.1',
+  '255.255.255.255',
+  '[2001:db8::1]',
+  '[fe80::1]',
+  '8.8.8.8',
+];
+
+for (const address of loopback) {
+  assert.strictEqual(net.isLoopback(address), true);
+}
+
+for (const address of loopbackNot) {
+  assert.strictEqual(net.isLoopback(address), false);
+}