net: fix SocketAddress.parse default port handling

lib/internal/socketaddress.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const {
+  NumberParseInt,
   ObjectSetPrototypeOf,
   Symbol,
 } = primordials;
@@ -153,18 +154,22 @@ class SocketAddress {
     // other pieces here that do... the destucturing, the SocketAddress
     // constructor, etc. So we wrap this in a try/catch to be safe.
     try {
-      const {
-        hostname: address,
+      // url.port strips default HTTP ports (e.g. 80), so parse the port from
+      // the raw input string instead.
+      const { hostname: address } = URLParse(`http://${input}`);
+
+      const isIPv6 = address[0] === '[' && address.endsWith(']');
+
+      // For IPv6, indexOf(']:') + 1 points at ':' (or 0 if absent, treated as no port).
+      // For IPv4, lastIndexOf(':') points at ':' (or -1 if absent).
+      const sepIdx = isIPv6 ? input.indexOf(']:') + 1 : input.lastIndexOf(':');
+      const port = sepIdx > 0 ? NumberParseInt(input.slice(sepIdx + 1), 10) || 0 : 0;
+
+      return new SocketAddress({
+        address: isIPv6 ? address.slice(1, -1) : address,
         port,
-      } = URLParse(`http://${input}`);
-      if (address.startsWith('[') && address.endsWith(']')) {
-        return new SocketAddress({
-          address: address.slice(1, -1),
-          port: port | 0,
-          family: 'ipv6',
-        });
-      }
-      return new SocketAddress({ address, port: port | 0 });
+        family: isIPv6 ? 'ipv6' : 'ipv4',
+      });
     } catch {
       // Ignore errors here. Return undefined if the input cannot
       // be successfully parsed or is not a proper socket address.

test/parallel/test-socketaddress.js

@@ -148,6 +148,10 @@ describe('net.SocketAddress...', () => {
       { input: '0x.0x.0', address: '0.0.0.0', port: 0, family: 'ipv4' },
       { input: '[1:0::]', address: '1::', port: 0, family: 'ipv6' },
       { input: '[1::8]:123', address: '1::8', port: 123, family: 'ipv6' },
+      { input: '127.0.0.1:80', address: '127.0.0.1', port: 80, family: 'ipv4' },
+      { input: '127.0.0.1:443', address: '127.0.0.1', port: 443, family: 'ipv4' },
+      { input: '[::1]:80', address: '::1', port: 80, family: 'ipv6' },
+      { input: '[::1]:443', address: '::1', port: 443, family: 'ipv6' },
     ];
 
     good.forEach((i) => {