The short version
Router lights are a quick status display. Most routers show whether the device has power, whether it can reach your internet provider, whether Wi-Fi is on, and whether wired devices are plugged in. Solid usually means a stable state, a flicker usually means data is moving, and an amber or red light usually points to a problem. Exact colors and meanings vary by brand and model, so your router’s manual or provider’s help page is the final word.
Why router lights differ between brands
There is no universal standard. One router may use white for “all good” while another uses green, and a light that is amber on one model may be red on another. Some routers have only one or two lights that change color, while others have a separate light for each function. Provider-supplied gateways often have their own labels, such as “Online” instead of “Internet.”
If something looks off, look up your exact model name (usually printed on the underside) and search for its light guide.
The lights most routers have
- Power: Shows the device has electricity. Solid is normal. Off can mean no power or a failed adapter. Red or amber can mean a startup or hardware problem on some models. If the power light is the only one lit, see ASUS router with only the power light on or Netgear router not lighting up.
- Internet, WAN, or globe: Shows whether the router can reach your provider. Solid (often green or white) is usually good. Off, amber, or red often means no connection.
- Wi-Fi (2.4 GHz and 5 GHz): Shows the wireless network is switched on. Flickering is typically normal activity. See flashing Wi-Fi light on your router.
- LAN or Ethernet: One per wired LAN port on many models. Lit means a device is connected, and flickering means traffic.
- WPS: Relates to Wi-Fi Protected Setup, a button-based pairing feature. A blinking WPS light usually means a pairing attempt is in progress.
- DSL, DS/US, or PON: Found on modems and gateways for certain connection types. These show whether the line has linked up with your provider. See no DSL light on your router.
For a breakdown of which lights are expected to flicker, see which lights should be blinking on a healthy router.
What colors usually mean
These are common patterns, not guarantees:
- Green or white: Working normally.
- Blue: Often an active or high-speed connection, or a pairing or setup mode on some models.
- Amber or orange: Often a warning, such as a weak link, a startup stage, or no connection yet.
- Red: Often a fault or no internet.
- Off: The function is inactive, or the light has been dimmed in settings. Some routers let you turn the lights off.
Solid, slow blinking, and fast flickering
- Solid: A stable state.
- Slow blinking: Often startup, firmware activity, or trying to connect.
- Fast flickering: Usually data moving, which is normal on Wi-Fi and LAN lights.
If a light blinks slowly for a long time and the internet does not work, that is worth acting on. For the internet light specifically, see why the internet light keeps blinking.
What a fiber ONT is
ONT stands for optical network terminal. It is the box (or built-in part of your gateway) that converts the fiber signal from your provider into a form your router can use. ONTs often have lights such as Power, PON, and LOS or Alarm. The labels vary, so check your provider’s guide. A steady PON light generally indicates the ONT has linked to the provider’s network, while an alarm light usually suggests a fiber or line problem.
What to try first when a light looks wrong
- Check your provider’s app or website for an outage.
- Make sure power, coax, phone, fiber, and Ethernet cables are firmly seated and undamaged.
- Restart the equipment: unplug the modem and router, wait about a minute, plug the modem in first, give it a few minutes, then plug in the router.
- Note the light name, color, and pattern before contacting support.
Can the lights show someone is monitoring your Wi-Fi?
Not really. The lights show activity, not who or what is causing it. A flickering Wi-Fi light just means data is being sent. To see which devices are connected, log in to your router’s admin page or provider app and review the device list (our guides on router logs and removing devices from a Linksys router go further). If you see devices you do not recognize, changing your Wi-Fi password is a sensible step.
When to contact your provider
If the internet light stays off or red after a restart and cable check, or an ONT shows an alarm light, contact your provider. Many problems on the line cannot be fixed from your side.