diff --git a/Misc/NEWS b/Misc/NEWS
index db250cd378b..e9fe6c7c981 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -81,6 +81,12 @@ Core and Builtins
 Library
 -------
 
+- Issue #24684: socket.socket.getaddrinfo() now calls
+  PyUnicode_AsEncodedString() instead of calling the encode() method of the
+  host, to handle correctly custom string with an encode() method which doesn't
+  return a byte string. The encoder of the IDNA codec is now called directly
+  instead of calling the encode() method of the string.
+
 - Issue #24982: shutil.make_archive() with the "zip" format now adds entries
   for directories (including empty directories) in ZIP file.
 
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index b6f2bf53ab8..23019ee9a7a 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -5213,9 +5213,7 @@ socket_getaddrinfo(PyObject *self, PyObject *args, PyObject* kwargs)
     if (hobj == Py_None) {
         hptr = NULL;
     } else if (PyUnicode_Check(hobj)) {
-        _Py_IDENTIFIER(encode);
-
-        idna = _PyObject_CallMethodId(hobj, &PyId_encode, "s", "idna");
+        idna = PyUnicode_AsEncodedString(hobj, "idna", NULL);
         if (!idna)
             return NULL;
         assert(PyBytes_Check(idna));