diff --git a/homeassistant/components/knx/__init__.py b/homeassistant/components/knx/__init__.py
index 9180e287618..ea654c358e7 100644
--- a/homeassistant/components/knx/__init__.py
+++ b/homeassistant/components/knx/__init__.py
@@ -54,6 +54,7 @@ from .const import (
     CONF_KNX_SECURE_USER_PASSWORD,
     CONF_KNX_STATE_UPDATER,
     CONF_KNX_TELEGRAM_LOG_SIZE,
+    CONF_KNX_TUNNEL_ENDPOINT_IA,
     CONF_KNX_TUNNELING,
     CONF_KNX_TUNNELING_TCP,
     CONF_KNX_TUNNELING_TCP_SECURE,
@@ -352,6 +353,7 @@ class KNXModule:
         if _conn_type == CONF_KNX_TUNNELING_TCP:
             return ConnectionConfig(
                 connection_type=ConnectionType.TUNNELING_TCP,
+                individual_address=self.entry.data.get(CONF_KNX_TUNNEL_ENDPOINT_IA),
                 gateway_ip=self.entry.data[CONF_HOST],
                 gateway_port=self.entry.data[CONF_PORT],
                 auto_reconnect=True,
@@ -364,6 +366,7 @@ class KNXModule:
         if _conn_type == CONF_KNX_TUNNELING_TCP_SECURE:
             return ConnectionConfig(
                 connection_type=ConnectionType.TUNNELING_TCP_SECURE,
+                individual_address=self.entry.data.get(CONF_KNX_TUNNEL_ENDPOINT_IA),
                 gateway_ip=self.entry.data[CONF_HOST],
                 gateway_port=self.entry.data[CONF_PORT],
                 secure_config=SecureConfig(
diff --git a/homeassistant/components/knx/const.py b/homeassistant/components/knx/const.py
index 7a9dfc34546..a946ded0359 100644
--- a/homeassistant/components/knx/const.py
+++ b/homeassistant/components/knx/const.py
@@ -104,7 +104,7 @@ class KNXConfigEntryData(TypedDict, total=False):
     route_back: bool  # not required
     host: str  # only required for tunnelling
     port: int  # only required for tunnelling
-    tunnel_endpoint_ia: str | None
+    tunnel_endpoint_ia: str | None  # tunnelling only - not required (use get())
     # KNX secure
     user_id: int | None  # not required
     user_password: str | None  # not required