diff --git a/homeassistant/components/dhcp/__init__.py b/homeassistant/components/dhcp/__init__.py
index a3de0e51708..0b5f8a49a34 100644
--- a/homeassistant/components/dhcp/__init__.py
+++ b/homeassistant/components/dhcp/__init__.py
@@ -159,7 +159,7 @@ class WatcherBase:
     async def async_start(self):
         """Start the watcher."""
 
-    def process_client(self, ip_address, hostname, mac_address):
+    def process_client(self, ip_address: str, hostname: str, mac_address: str) -> None:
         """Process a client."""
         return run_callback_threadsafe(
             self.hass.loop,
@@ -170,7 +170,9 @@ class WatcherBase:
         ).result()
 
     @callback
-    def async_process_client(self, ip_address, hostname, mac_address):
+    def async_process_client(
+        self, ip_address: str, hostname: str, mac_address: str
+    ) -> None:
         """Process a client."""
         made_ip_address = make_ip_address(ip_address)
 
@@ -355,15 +357,15 @@ class DeviceTrackerRegisteredWatcher(WatcherBase):
     async def async_start(self):
         """Stop watching for device tracker registrations."""
         self._unsub = async_dispatcher_connect(
-            self.hass, CONNECTED_DEVICE_REGISTERED, self._async_process_device_state
+            self.hass, CONNECTED_DEVICE_REGISTERED, self._async_process_device_data
         )
 
     @callback
-    def _async_process_device_state(self, data: dict[str, Any]) -> None:
+    def _async_process_device_data(self, data: dict[str, str | None]) -> None:
         """Process a device tracker state."""
-        ip_address = data.get(ATTR_IP)
-        hostname = data.get(ATTR_HOST_NAME, "")
-        mac_address = data.get(ATTR_MAC)
+        ip_address = data[ATTR_IP]
+        hostname = data[ATTR_HOST_NAME] or ""
+        mac_address = data[ATTR_MAC]
 
         if ip_address is None or mac_address is None:
             return
diff --git a/tests/components/dhcp/test_init.py b/tests/components/dhcp/test_init.py
index d1b8d72be67..a809d6eb5ab 100644
--- a/tests/components/dhcp/test_init.py
+++ b/tests/components/dhcp/test_init.py
@@ -663,6 +663,28 @@ async def test_device_tracker_registered(hass):
     await hass.async_block_till_done()
 
 
+async def test_device_tracker_registered_hostname_none(hass):
+    """Test handle None hostname."""
+    with patch.object(hass.config_entries.flow, "async_init") as mock_init:
+        device_tracker_watcher = dhcp.DeviceTrackerRegisteredWatcher(
+            hass,
+            {},
+            [{"domain": "mock-domain", "hostname": "connect", "macaddress": "B8B7F1*"}],
+        )
+        await device_tracker_watcher.async_start()
+        await hass.async_block_till_done()
+        async_dispatcher_send(
+            hass,
+            CONNECTED_DEVICE_REGISTERED,
+            {"ip": "192.168.210.56", "mac": "b8b7f16db533", "host_name": None},
+        )
+        await hass.async_block_till_done()
+
+    assert len(mock_init.mock_calls) == 0
+    await device_tracker_watcher.async_stop()
+    await hass.async_block_till_done()
+
+
 async def test_device_tracker_hostname_and_macaddress_after_start(hass):
     """Test matching based on hostname and macaddress after start."""