diff --git a/Misc/NEWS b/Misc/NEWS
index 7a48b062045..bc9a4b7fc97 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -14,6 +14,12 @@ 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 #25060: Correctly compute stack usage of the BUILD_MAP opcode.
 
 - Issue #24857: Comparing call_args to a long sequence now correctly returns a
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index ee249070c38..d9c70f86654 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -5513,9 +5513,7 @@ 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));