Your router keeps a list of phones, laptops, TVs, and other clients on the LAN. Checking that list helps you find unknown devices, free bandwidth, and improve security.
Why this matters
- Unknown devices can slow the network or use your data plan.
- Blocking by MAC address stops a client from rejoining until you allow it again (or until they spoof a MAC, so also change the Wi-Fi password).
Step 1: Log into the router
Open your gateway IP in the browser and sign in. Help: log into your router. Find the IP with these OS steps.
Step 2: Open the connected devices list
Look for menus named Attached Devices, Device List, DHCP Clients, LAN Clients, Access Control, or Home Network. Exact labels vary by brand.
- TP-Link: often Advanced → Network → DHCP Client List or Access Control
- Netgear: Attached Devices
- ASUS: Network Map or Client Status
- Xfinity: Devices in the app or at 10.0.0.1
Step 3: Identify each device
Match hostnames you recognize. For blank or odd names, note the MAC address. You can compare against phone Wi-Fi details. A MAC lookup only suggests a vendor; it is not perfect identity.
Step 4: Block an unwanted device
- Select the device or enter its MAC in Access Control / Blacklist / MAC Filter.
- Set the mode to deny or blacklist (wording varies).
- Save and apply.
- Change the Wi-Fi password so the person cannot join again with a new device: change Wi-Fi password.
Tips and warnings
- MAC filters are helpful but not foolproof.
- Do not block your own admin PC by mistake while on Wi-Fi; use Ethernet if you are unsure.
- Guest networks keep visitors off your main LAN: guest Wi-Fi guide.
FAQ
Why do I see more devices than people at home?
Phones, watches, TVs, printers, bulbs, and game consoles each count as a client. Some devices create multiple connections.
Can I limit a device’s speed instead of blocking?
Some routers offer QoS or per-device limits. See limit bandwidth on a router.
Related: identify a device by MAC address, troubleshooting hub.