diff --git a/telethon/telegram_bare_client.py b/telethon/telegram_bare_client.py
index 7ebf5ec1..b9329689 100644
--- a/telethon/telegram_bare_client.py
+++ b/telethon/telegram_bare_client.py
@@ -69,6 +69,7 @@ class TelegramBareClient:
 
     def __init__(self, session, api_id, api_hash,
                  connection_mode=ConnectionMode.TCP_FULL,
+                 use_v6=False,
                  proxy=None,
                  update_workers=None,
                  spawn_read_thread=False,
@@ -82,7 +83,7 @@ class TelegramBareClient:
 
         # Determine what session object we have
         if isinstance(session, str) or session is None:
-            session = Session.try_load_or_create_new(session)
+            session = Session.try_load_or_create_new(session, use_v6)
         elif not isinstance(session, Session):
             raise ValueError(
                 'The given session must be a str or a Session instance.'
diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index 5a5d99ec..6140ff59 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -69,6 +69,7 @@ class TelegramClient(TelegramBareClient):
 
     def __init__(self, session, api_id, api_hash,
                  connection_mode=ConnectionMode.TCP_FULL,
+                 use_v6=False,
                  proxy=None,
                  update_workers=None,
                  timeout=timedelta(seconds=5),
@@ -113,6 +114,7 @@ class TelegramClient(TelegramBareClient):
         super().__init__(
             session, api_id, api_hash,
             connection_mode=connection_mode,
+            use_v6=use_v6,
             proxy=proxy,
             update_workers=update_workers,
             spawn_read_thread=spawn_read_thread,
diff --git a/telethon/tl/session.py b/telethon/tl/session.py
index f597048f..6ded7dc8 100644
--- a/telethon/tl/session.py
+++ b/telethon/tl/session.py
@@ -18,7 +18,7 @@ class Session:
        If you think the session has been compromised, close all the sessions
        through an official Telegram client to revoke the authorization.
     """
-    def __init__(self, session_user_id):
+    def __init__(self, session_user_id, use_v6=False):
         """session_user_id should either be a string or another Session.
            Note that if another session is given, only parameters like
            those required to init a connection will be copied.
@@ -64,7 +64,10 @@ class Session:
         self._last_msg_id = 0  # Long
 
         # These values will be saved
-        self.server_address = '91.108.56.165'
+        if use_v6:
+            self.server_address = '[2001:67c:4e8:f002::a]'
+        else:
+            self.server_address = '91.108.56.165'
         self.port = 443
         self.auth_key = None
         self.layer = 0
@@ -109,15 +112,15 @@ class Session:
                 for f in os.listdir('.') if f.endswith('.session')]
 
     @staticmethod
-    def try_load_or_create_new(session_user_id):
+    def try_load_or_create_new(session_user_id, use_v6=False):
         """Loads a saved session_user_id.session or creates a new one.
            If session_user_id=None, later .save()'s will have no effect.
         """
         if session_user_id is None:
-            return Session(None)
+            return Session(None, use_v6)
         else:
             path = '{}.session'.format(session_user_id)
-            result = Session(session_user_id)
+            result = Session(session_user_id, use_v6)
             if not file_exists(path):
                 return result