RouterEntry · Sources checked · How we write our guides
Recognize the right fields
- Model: CobraXh
- Telstra’s identifier for Smart Modem Gen 3.
- Wi-Fi password
- The original Wi-Fi key also supplies the original Gen 3 admin password.
- Username: admin
- Use this with the current administrator password.
Find the Wi-Fi settings
- Wi-Fi
- Name / security key
- Apply
Telstra lists CobraXh as the Smart Modem Gen 3 model. Check underneath or behind the modem, or view the equipment details for your internet service in My Telstra. Gen 2 and Gen 4 have different model identifiers.
Open mymodem or the local address
- Join the modem’s home network.
- Open http://mymodem or http://192.168.0.1 in the browser address bar.
- The original username is admin. For Gen 3, Telstra says to use the Wi-Fi password printed underneath the modem as the original login password. Use the current admin password if it was changed.
Only use this address while connected to your own network.
Why older Telstra instructions may fail
Telstra documents a different original password for Gen 2 and 1.1. Do not apply that default to a Gen 3 just because the brand is the same. Check the exact modem generation first.
Change your Wi-Fi name or password
For Gen 3, open Wi-Fi, edit the network name or security-key field and select Apply. The newer Gen 4 guide uses a different menu label. Reconnect devices whose Wi-Fi settings changed.
Share guest Wi-Fi without sharing administration
On the documented Gen 3 interface, choose Wi-Fi → Guest under Networks. Enable its State control, set the guest name and password and select Save. Share the guest Wi-Fi details, not your local admin password or Telstra account. If the Guest screen is absent, check the generation-specific guide rather than following Gen 4 screenshots.
If your administrator password is rejected
Confirm Gen 3 and username admin, then check your saved administrator password. A newly chosen Wi-Fi key does not necessarily replace the original label-based administration password. Telstra account recovery is a separate process.
If you still cannot sign in, use the support options on Telstra’s linked guide and identify your modem as Smart Modem Gen 3 / CobraXh. Ask for the matching recovery procedure before a factory reset, which removes custom settings. The reset instructions for Smart Modem 4 on Telstra’s settings page are not evidence for a Gen 3 reset-button duration.
If you use Internet Optimiser, its Reset DumaOS option clears only Internet Optimiser configuration. Telstra’s manual says the underlying Smart Modem settings are unaffected, so this is not a way to restore a forgotten modem administrator password. Tell Telstra whether the local login rejects your password or Internet Optimiser fails after successful sign-in; those are different faults.
If the login page is unreachable
Check the gateway of your active connection, especially if another router or mesh system sits between your device and the modem. A browser on mobile data will not be on the modem’s local network.
Internet works, but the modem stays blue?
For an nbn service, Telstra’s older-modem guide describes blue as mobile backup rather than the fixed nbn connection. Check the cable connections and the separate nbn equipment before assuming that successful browsing proves the fixed service has recovered. This interpretation does not apply to a 4G or 5G Home Wireless service.
When every device loses internet
Check Telstra’s service status first. Its modem restart guide describes removing modem power for 10 seconds, reconnecting it and waiting a few minutes. This temporarily interrupts service; it is not a factory reset. Separate nbn or Opticomm equipment has its own restart instructions, so use the official guide for that device.
Use the no-internet checklist to compare device and shared-service symptoms before changing settings.
Check access for this model
For Gen 3 (CobraXh), connect to the modem’s network and open http://mymodem or 192.168.0.1. Read the active gateway if another router sits between you and the modem.
When a password is rejected
Check your saved Gen 3 administrator password and confirm CobraXh. Gen 2 defaults and Gen 4 reset steps do not establish Gen 3 recovery. Ask Telstra for a Gen 3-specific recovery procedure before a factory reset removes your custom settings. Internet Optimiser’s Reset DumaOS clears optimiser settings only; it does not recover the modem administrator password.
Use the official My Telstra account-recovery route. Your Telstra account is separate from the modem’s local admin sign-in.
Compare password recovery options →
When several devices lose internet
Check Telstra service status and its restart guidance. Any separate nbn or Opticomm connection device has its own instructions; do not treat it as the modem.
Get the next check for your Telstra Smart Modem Gen 3.