192.168.100.1 Router Login
192.168.100.1 is not a router address at all. It belongs to the modem or fibre terminal in front of your router, and it is where signal quality and line status live.
Which routers answer on 192.168.100.1
Every DOCSIS cable modem answers here, whatever the provider and whatever brand is on the box, because the address is part of the standard rather than a manufacturer choice. Huawei fibre ONTs use it too, as do many GPON terminals supplied with fibre installations.
What you find is a diagnostics page rather than a settings panel. There is usually no Wi-Fi configuration, no port forwarding and nothing to change — instead you get downstream and upstream power levels, signal-to-noise ratios and error counts. That makes it the single most useful page on your network when the connection is unstable and you need to show your provider evidence.
Signing in
- 01
Connect to the router first
Join its Wi-Fi or plug into a LAN port. A private address is unreachable from mobile data or from any other network, so this step is not optional.
- 02
Open the address properly
Type
http://192.168.100.1in the address bar rather than the search box. - 03
Accept the certificate warning
Routers rarely carry a trusted TLS certificate. On your own hardware the warning is expected; choose Advanced then Proceed.
- 04
Sign in and change the password
Check the sticker on the unit first — it overrides any published list. Then replace the factory admin password before you do anything else.
Default logins for 192.168.100.1
Factory credentials for the hardware most often found on this address. Where the label on your unit disagrees, the label wins.
| Brand / model family | Username | Password |
|---|---|---|
| Cable modems (DOCSIS) | admin | Printed on label |
| Arris / Motorola | admin | motorola or on label |
| Huawei ONT | root | admin |
| Generic GPON terminal | admin | admin |
More brands: the full default password reference.
192.168.100.1 not opening?
On many modems this page is reachable even when the internet is down, which is exactly when you want it. If it does not load, your router may be handing you an address on a different subnet; connecting a computer directly to the modem usually restores access.
The fastest way to settle it is to read the gateway address off the device in your hand rather than working down a list. On Windows run ipconfig and read Default Gateway; on macOS open System Settings › Network › Details › TCP/IP and read Router.
Full diagnostic sequence: eight fixes for a router login page that will not load. Compare every address: the router IP directory.