CenturyLink / Quantum Fiber Router Login
CenturyLink has been rebranding their fiber service as Quantum Fiber, but the equipment and login process are largely the same — so whether your bill says CenturyLink or Quantum, this guide covers both. The login address for most CenturyLink-provided equipment is 192.168.0.1, though this varies by model.
The biggest source of confusion with CenturyLink is the equipment itself. Depending on whether you have DSL or fiber, and when you signed up, you could have a standalone modem, a modem-router combo (gateway), or a separate modem plus your own router. Each scenario has different login details.
Find Your Equipment Type
Greenwave C4000 Series (Current Fiber)
This is the most commonly deployed gateway for CenturyLink/Quantum fiber customers right now. It's an all-in-one unit that handles the fiber connection and WiFi.
| Login IP | 192.168.0.1 |
|---|---|
| Username | admin |
| Password | Printed on the bottom label (unique per device) |
The C4000 has a modern interface with a dashboard showing connected devices, internet speed, and WiFi status. It supports WiFi 6, has 4 Ethernet ports, and can handle gigabit fiber speeds.
Zyxel C3000Z (Older Fiber/VDSL)
An older combo gateway that served both VDSL (bonded DSL, CenturyLink's pre-fiber broadband) and some early fiber installations.
| Login IP | 192.168.0.1 |
|---|---|
| Username | admin |
| Password | On device label |
The Zyxel interface feels dated but functional. WiFi settings are under Wireless Setup, and DSL line stats are under Modem Status if you want to check your sync rate.
Actiontec C1900A / C1000A (DSL)
The typical DSL gateway. Handles both the DSL modem function and WiFi. Common in areas where CenturyLink hasn't rolled out fiber yet.
| Login IP | 192.168.0.1 |
|---|---|
| Username | admin |
| Password | On device label, or admin on very old units |
Using Your Own Router
CenturyLink fiber customers can ditch the CenturyLink gateway entirely and use their own router — with a catch. CenturyLink fiber uses PPPoE authentication in most markets, meaning your router needs your CenturyLink PPPoE username and password to connect. These are different from your CenturyLink.com account credentials — they were provided during installation or on your account documentation.
To set up your own router: connect its WAN port to the ONT (fiber terminal), go into the router's internet/WAN settings, select PPPoE, enter your CenturyLink PPPoE username (usually your CenturyLink email) and password, and save. If you don't have your PPPoE credentials, you'll need to call CenturyLink support to get them.
Changing Your WiFi Settings
- Login at 192.168.0.1
- Go to Wireless Setup (C3000Z/Actiontec) or WiFi (C4000)
- Change the SSID (network name) and Pre-Shared Key (password)
- Make sure security is set to WPA2 or WPA3
- Apply/Save — devices will need the new password
On the C4000, you can also manage the 2.4 GHz and 5 GHz bands separately, enable or disable band steering (which automatically moves devices to the best band), and set up a guest network.
Checking Your Connection Speed
For DSL customers, the admin panel shows your actual sync rate — the maximum speed your physical line can support, which may be lower than what you're paying for if you're far from the DSLAM (CenturyLink's street-side equipment). Look under Modem Status or DSL Stats for your downstream and upstream sync rates.
For fiber customers, the gateway typically shows your provisioned speed tier. If you're paying for gigabit but seeing slower speeds on WiFi, the bottleneck is usually WiFi itself — plug in via Ethernet to test the true fiber speed, or upgrade to a WiFi 6 router if your gateway is older.
Troubleshooting
192.168.0.1 loads a different brand's page. You might be hitting your own router instead of the CenturyLink gateway. If you added a personal router and it also uses 192.168.0.1 (like a D-Link or TP-Link), there's a conflict. Connect directly to the CenturyLink unit's WiFi or Ethernet to reach it.
DSL light is blinking or off. This isn't a login issue — your line isn't syncing. Check that the phone line from the wall goes to the DSL port (not a phone port). Make sure DSL filters are installed on every phone jack that has a phone connected. If the line was working and stopped, it's likely a CenturyLink network issue — check their outage map or call support.
Internet works but 192.168.0.1 won't load. Try a different browser, clear cache, or check your default gateway with ipconfig. Some CenturyLink gateways get reassigned to a different IP if there's another router on the network.
Factory reset: Pinhole Reset button on the back, hold 10-15 seconds. On DSL gateways, this also wipes PPPoE credentials — you'll need to re-enter them during setup, so have them handy.