Optus Modem Login & Default Password – Step by Step
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Need to log in to your Optus modem to change the Wi-Fi password or settings? Here’s the admin address, the default login by model, and how to reset it if you’re locked out. The Original PC Doctor can recover access and secure your modem remotely if you get stuck.
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How to log in to your Optus modem
- Connect a device to the modem (Wi-Fi or cable).
- Open a browser and go to http://192.168.0.1.
- Enter the admin login from the table below (or the sticker on your modem).
Default login for Optus modems
| Modem | Admin URL | Default credentials |
|---|---|---|
| Ultra WiFi (Gen 2) / newer Sagemcom | 192.168.0.1 | Username optus (lowercase), password = Wi-Fi password on the label |
| Older Sagemcom F@st (e.g. 3864) | 192.168.0.1 | Username admin, password admin (or on the label) |
The exact login is printed on the sticker on the base/back of your modem – always check there first, as it varies by model and may have been changed.
Forgot the password? Reset it
Press and hold the reset button for about 15 seconds until the modem restarts. This restores factory defaults (the credentials on the label) but wipes any custom Wi-Fi name/password and settings.
Changing your Wi-Fi name & password
Once logged in, open the Wi-Fi / Wireless settings (or use the My Optus app) to change the network name and password. Use a strong password on both bands. We can do this remotely and secure the modem for you.
Common Optus modem problems we fix
- Forgotten login
- 192.168.0.1 won’t open
- The optus/admin password is rejected
- Locked out after changes
- Changing the Wi-Fi password
- A reset cleared the settings
Newer Sagemcom units log in with username optus and the Wi-Fi password; older ones use admin/admin — the sticker is the source of truth. We can recover access and re-secure the modem remotely.
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Frequently asked questions
What is the default login for an Optus modem?
Browse to 192.168.0.1. On the Ultra WiFi Gen 2 and newer Sagemcom modems the username is optus (lowercase) with the Wi-Fi password from the label; older Sagemcom models often use admin/admin. The exact details are on the modem’s sticker.
What is the IP address for an Optus modem?
192.168.0.1 – type http://192.168.0.1 into your browser while connected to the modem.
I forgot my Optus modem password – what do I do?
Hold the reset button for about 15 seconds to factory-reset the modem, then use the default login on the label. Note this also clears any custom Wi-Fi settings.
How do I change my Optus Wi-Fi password?
Log in at 192.168.0.1 (or use the My Optus app), open the Wi-Fi settings, and set a new password on both bands. We can do this for you remotely if needed.
More Optus modem guides
← Back to the Optus Modem Setup & Support hub.
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