diff --git a/googledevices/cli/commands.py b/googledevices/cli/commands.py
index 2655914..6be6c26 100644
--- a/googledevices/cli/commands.py
+++ b/googledevices/cli/commands.py
@@ -46,17 +46,35 @@ async def get_device_info():
 
 
 @scan_network_group.command()
-@click.argument('subnet', required=1)
-def scan_network(subnet):
+@click.option('--network', '-N', type=str, default=None,
+              help="The network you want to scan\
+              in this format '192.168.1.0/24'.")
+@click.option('--feature', '-F', type=str, default=None,
+              help="Filter discovery result to\
+              units that contain these feature.")
+def scan_network(network, feature):
     """Scan the entire subnet for Google devices."""
     from googledevices.utils.scan import NetworkScan
 
     async def get_all_units():
-        """Get device info from GH."""
+        """Get device info for all Google devices."""
+        all_devices = []
+        if network is None:
+            import netifaces
+            gateway = netifaces.gateways()
+            subnet = gateway['default'][netifaces.AF_INET][0][:-1] + '0/24'
+        else:
+            subnet = network
         async with aiohttp.ClientSession() as session:
             googledevices = NetworkScan(LOOP, session)
             result = await googledevices.scan_for_units(subnet)
-            print(json.dumps(result, indent=4, sort_keys=True))
+            if feature:
+                for unit in result:
+                    if unit[feature]:
+                        all_devices.append(unit)
+            else:
+                all_devices = result
+            print(json.dumps(all_devices, indent=4, sort_keys=True))
     LOOP.run_until_complete(get_all_units())
 
 
diff --git a/setup.py b/setup.py
index 371fd07..3ca6a43 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
     author_email="ludeeus@gmail.com",
     description="",
     long_description=LONG,
-    install_requires=['aiohttp', 'async_timeout', 'click'],
+    install_requires=['aiohttp', 'async_timeout', 'click', 'netifaces'],
     long_description_content_type="text/markdown",
     url="https://github.com/ludeeus/googledevices",
     packages=setuptools.find_packages(),