diff --git a/homeassistant/components/keenetic_ndms2/config_flow.py b/homeassistant/components/keenetic_ndms2/config_flow.py
index 3862d34398f..c6095968c07 100644
--- a/homeassistant/components/keenetic_ndms2/config_flow.py
+++ b/homeassistant/components/keenetic_ndms2/config_flow.py
@@ -8,7 +8,12 @@ from urllib.parse import urlparse
 from ndms2_client import Client, ConnectionException, InterfaceInfo, TelnetConnection
 import voluptuous as vol
 
-from homeassistant.config_entries import ConfigFlow, ConfigFlowResult, OptionsFlow
+from homeassistant.config_entries import (
+    SOURCE_RECONFIGURE,
+    ConfigFlow,
+    ConfigFlowResult,
+    OptionsFlow,
+)
 from homeassistant.const import (
     CONF_HOST,
     CONF_PASSWORD,
@@ -45,7 +50,7 @@ class KeeneticFlowHandler(ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    host: str | bytes | None = None
+    _host: str | bytes | None = None
 
     @staticmethod
     @callback
@@ -61,8 +66,9 @@ class KeeneticFlowHandler(ConfigFlow, domain=DOMAIN):
         """Handle a flow initialized by the user."""
         errors = {}
         if user_input is not None:
-            host = self.host or user_input[CONF_HOST]
-            self._async_abort_entries_match({CONF_HOST: host})
+            host = self._host or user_input[CONF_HOST]
+            if self.source != SOURCE_RECONFIGURE:
+                self._async_abort_entries_match({CONF_HOST: host})
 
             _client = Client(
                 TelnetConnection(
@@ -81,12 +87,17 @@ class KeeneticFlowHandler(ConfigFlow, domain=DOMAIN):
             except ConnectionException:
                 errors["base"] = "cannot_connect"
             else:
+                if self.source == SOURCE_RECONFIGURE:
+                    return self.async_update_reload_and_abort(
+                        self._get_reconfigure_entry(),
+                        data={CONF_HOST: host, **user_input},
+                    )
                 return self.async_create_entry(
                     title=router_info.name, data={CONF_HOST: host, **user_input}
                 )
 
         host_schema: VolDictType = (
-            {vol.Required(CONF_HOST): str} if not self.host else {}
+            {vol.Required(CONF_HOST): str} if not self._host else {}
         )
 
         return self.async_show_form(
@@ -102,6 +113,15 @@ class KeeneticFlowHandler(ConfigFlow, domain=DOMAIN):
             errors=errors,
         )
 
+    async def async_step_reconfigure(
+        self, user_input: dict[str, Any] | None = None
+    ) -> ConfigFlowResult:
+        """Handle reconfiguration."""
+        existing_entry_data = dict(self._get_reconfigure_entry().data)
+        self._host = existing_entry_data[CONF_HOST]
+
+        return await self.async_step_user(user_input)
+
     async def async_step_ssdp(
         self, discovery_info: SsdpServiceInfo
     ) -> ConfigFlowResult:
@@ -124,7 +144,7 @@ class KeeneticFlowHandler(ConfigFlow, domain=DOMAIN):
 
         self._async_abort_entries_match({CONF_HOST: host})
 
-        self.host = host
+        self._host = host
         self.context["title_placeholders"] = {
             "name": friendly_name,
             "host": host,
diff --git a/homeassistant/components/keenetic_ndms2/strings.json b/homeassistant/components/keenetic_ndms2/strings.json
index 93b59be122d..3098996d48f 100644
--- a/homeassistant/components/keenetic_ndms2/strings.json
+++ b/homeassistant/components/keenetic_ndms2/strings.json
@@ -21,7 +21,8 @@
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_account%]",
       "no_udn": "SSDP discovery info has no UDN",
-      "not_keenetic_ndms2": "Discovered device is not a Keenetic router"
+      "not_keenetic_ndms2": "Discovered device is not a Keenetic router",
+      "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
     }
   },
   "options": {
diff --git a/tests/components/keenetic_ndms2/__init__.py b/tests/components/keenetic_ndms2/__init__.py
index dc0c89e8ea6..dc812af6d01 100644
--- a/tests/components/keenetic_ndms2/__init__.py
+++ b/tests/components/keenetic_ndms2/__init__.py
@@ -25,6 +25,12 @@ MOCK_DATA = {
     CONF_PORT: 23,
 }
 
+MOCK_RECONFIGURE = {
+    CONF_USERNAME: "user1",
+    CONF_PASSWORD: "pass1",
+    CONF_PORT: 123,
+}
+
 MOCK_OPTIONS = {
     CONF_SCAN_INTERVAL: 15,
     const.CONF_CONSIDER_HOME: 150,
diff --git a/tests/components/keenetic_ndms2/test_config_flow.py b/tests/components/keenetic_ndms2/test_config_flow.py
index 3293bd3d4da..1b86e6c265c 100644
--- a/tests/components/keenetic_ndms2/test_config_flow.py
+++ b/tests/components/keenetic_ndms2/test_config_flow.py
@@ -19,7 +19,14 @@ from homeassistant.helpers.service_info.ssdp import (
     ATTR_UPNP_UDN,
 )
 
-from . import MOCK_DATA, MOCK_NAME, MOCK_OPTIONS, MOCK_SSDP_DISCOVERY_INFO
+from . import (
+    MOCK_DATA,
+    MOCK_IP,
+    MOCK_NAME,
+    MOCK_OPTIONS,
+    MOCK_RECONFIGURE,
+    MOCK_SSDP_DISCOVERY_INFO,
+)
 
 from tests.common import MockConfigEntry
 
@@ -75,6 +82,34 @@ async def test_flow_works(hass: HomeAssistant, connect) -> None:
     assert len(mock_setup_entry.mock_calls) == 1
 
 
+async def test_reconfigure(hass: HomeAssistant, connect) -> None:
+    """Test reconfigure flow."""
+    entry = MockConfigEntry(domain=keenetic.DOMAIN, data=MOCK_DATA)
+    entry.add_to_hass(hass)
+
+    result = await entry.start_reconfigure_flow(hass)
+
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "user"
+
+    with patch(
+        "homeassistant.components.keenetic_ndms2.async_setup_entry", return_value=True
+    ) as mock_setup_entry:
+        result2 = await hass.config_entries.flow.async_configure(
+            result["flow_id"],
+            user_input=MOCK_RECONFIGURE,
+        )
+        await hass.async_block_till_done()
+
+    assert result2["type"] is FlowResultType.ABORT
+    assert result2["reason"] == "reconfigure_successful"
+    assert entry.data == {
+        CONF_HOST: MOCK_IP,
+        **MOCK_RECONFIGURE,
+    }
+    assert len(mock_setup_entry.mock_calls) == 1
+
+
 async def test_options(hass: HomeAssistant) -> None:
     """Test updating options."""
     entry = MockConfigEntry(domain=keenetic.DOMAIN, data=MOCK_DATA)