Router WAN IP Shows 0.0.0.0? Causes and Fixes

What 0.0.0.0 Means

A WAN field showing 0.0.0.0 means the router did not receive a public IP address from your internet provider. The router can still serve a working local Wi-Fi network, but the upstream internet connection is not established.

The WAN side is separate from the local network. In normal operation, the router asks the modem or ONT for an address; when no answer comes back, the field stays at zero. For more background on the components and addressing, see the LAN vs WAN explainer and the DHCP explainer.

Check the Physical WAN Link

The quickest wins are physical. Confirm that the Ethernet cable from your modem, ONT, or wall jack is plugged into the port labeled WAN or Internet. Routers often color that port differently from the LAN ports. A loose, pinched, or damaged cable can keep the WAN unconfigured even when the rest of the network looks normal.

If your router connects through a cellular data plan, the equivalent check is the SIM card. Make sure the SIM is seated fully, the plan is active, and the router's mobile settings match the carrier, because the router needs to register before it can request an IP.

• The WAN cable is firmly inserted at both the router and the modem or ONT.
• The WAN cable is in the WAN port, not a LAN port.
• The modem or ONT is powered on and its upstream light is normal.
• The router's WAN light is on or blinking.
• No network switch sits between the modem and the router's WAN port unless the setup intentionally uses one.

Check the WAN Connection Type

Routers ask for an address in different ways. Most cable and fiber services use DHCP, where the router simply requests an address. Some fiber and DSL services use PPPoE, which needs a username and password from the ISP. If the router is set to the wrong mode, the WAN IP can stay at 0.0.0.0.

Open the router admin page and find the WAN or Internet settings. Compare the current mode with what your ISP expects or with the old router that used to work. For the details, see the PPPoE explainer and the steps for changing the WAN connection type. Do not enter a static IP unless your ISP assigned one; a partially entered static setup will also prevent the WAN from completing.

Power Cycle in the Right Order

A stale session between the modem and the ISP can stop the router from getting a new address. Turn off the router first, then turn off the modem or ONT. Wait briefly, power the modem or ONT back on, let it register, and only then power the router back on. The router should ask for an address only after the upstream device is online.

For a cellular router, use a similar sequence: remove the SIM, wait, reinsert it, and restart the router. Avoid holding the reset button during a normal restart; save that for the moment when you are ready to erase the router's settings.

Look for ISP-Side Issues

After cabling and the connection type are ruled out, the fault can live with the provider. Outages, unactivated service, a modem or ONT that has not registered, or a suspended account can all leave the router without an upstream address.

Some providers link service to the MAC address of the modem or router. After you replace a device, the provider may not assign an address until the new device is recognized. See the guide on cloning a MAC address and then call the ISP so they can confirm the account and refresh the connection from their side.

Test with Another Cable or Router

To isolate the cause, bypass the router. Connect a computer directly to the modem or ONT and see whether it receives a public address. If the computer connects to the internet and the router does not, the router's WAN path is the problem. If the computer also fails, the fault is in the modem, ONT, wiring, or the provider connection.

If a second router works where the first router showed the all-zero WAN address, the first router may have a damaged WAN port or stuck firmware. Try a factory reset and a firmware update before giving up. If the second router also reports all zeros, look upstream.

Other Modes That Make the WAN Look Empty

A router running in bridge mode, access point mode, or with a dual-WAN setup can display 0.0.0.0 even while its wireless network works, because it is not the device asking for the public IP. Confirm which operating mode is selected and which WAN interface is the active one.

Read the bridge mode and dual WAN explainers to see whether the router is waiting for an active WAN that is not connected. If the model has a multi-gig or fiber WAN port, also check the port settings; some WAN port types need to be configured separately.

When to Replace the Router

If every check passes and another router works while yours keeps showing 0.0.0.0, the router's WAN port or firmware may have failed. Back up the settings if the router will let you, then choose a replacement that matches your internet connection and home size.

For fixed-line internet, the basic router picks cover straightforward replacements. If your internet depends on a cellular plan, browse the cellular router picks. For coverage across several rooms, the related mesh and mainstream router guides below are useful starting points.

What to pick for your use

Questions

Does 0.0.0.0 mean my router is broken?

Not necessarily. It means the router did not receive a public IP address. The cause is often a cable, modem, ISP account, or WAN connection type setting. Test another router before concluding the hardware is dead.

Can a factory reset fix a 0.0.0.0 WAN IP?

It can, if the router is stuck with a bad setting, but a reset erases every saved setting. You will need to reconfigure the router and your Wi-Fi from scratch afterward.

Should I call my ISP about 0.0.0.0?

Yes, after you have checked cables, rebooted both devices, and confirmed the WAN connection type. The ISP can check whether the line or account is active and can refresh the modem or ONT from its side.

Why does my router still work over Wi-Fi with a 0.0.0.0 WAN IP?

The local network does not depend on the public WAN address. The router can hand out private addresses to phones and computers, so Wi-Fi appears normal even though the upstream internet connection is not established.

What if my router uses a cellular connection and shows 0.0.0.0?

For a cellular router, 0.0.0.0 usually means the router cannot register with the mobile network. Check the SIM card, the plan status, and the router's mobile settings before investigating the Ethernet WAN.

Can repeated reboots cause the WAN IP to stay at 0.0.0.0?

No. Rebooting only forces a new DHCP request, which is a normal troubleshooting step. If the address returns to 0.0.0.0 after every reboot, something upstream is not answering.

Will a firmware update help with a 0.0.0.0 WAN IP?

Sometimes. Firmware updates can fix DHCP or PPPoE bugs. Check the maker's support page, back up your settings, and update when a short outage is acceptable.