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O2 Czech Republic O2 GateWay (ZyXEL) default password & login IP

The O2 Czech Republic O2 GateWay (ZyXEL) ships with a unique password printed on the device label, not a shared default — log in at http://10.0.0.138.

For regaining access to a router you own or administer. If you didn't set it up, ask whoever did.
Login address
http://http://10.0.0.138/
Gateway IP
10.0.0.138
Username
admin
Password
— on the device label —

The password is unique to your unit and printed on a sticker on the router (often labelled Password or Access Key).

Czech Republic's first row in the dataset — O2 CZ's ZyXEL-built gateway, label-unique rather than a shared default. Official O2 CZ support page states: "Uživatelské jméno = admin, Heslo najdete na štítku na spodní straně modemu" ("Username = admin, the password is on the label on the underside of the modem").

Factory reset

Connect via LAN cable, browse to http://10.0.0.138/. If the label password has been changed and forgotten, a factory reset via the recessed reset button restores the original label-printed credentials.

More O2 Czech Republic models

Source: O2 Czech Republic — Podpora (nastavení ZYXEL O2 GateWay)verified · updated 2026-09-28

FAQ

What is the default password for the O2 Czech Republic O2 GateWay (ZyXEL)?
The O2 Czech Republic O2 GateWay (ZyXEL) ships with a unique password printed on the device label, not a shared default — log in at http://10.0.0.138.
What is the default login IP for the O2 Czech Republic O2 GateWay (ZyXEL)?
The O2 Czech Republic O2 GateWay (ZyXEL) default login IP is 10.0.0.138 — open http://10.0.0.138 in a browser on the router's own network.
What is the default username for the O2 Czech Republic O2 GateWay (ZyXEL)?
The O2 Czech Republic O2 GateWay (ZyXEL) default admin username is admin. The matching password is unique to your unit and printed on the sticker on the router.
How do I factory-reset the O2 Czech Republic O2 GateWay (ZyXEL)?
Connect via LAN cable, browse to http://10.0.0.138/. If the label password has been changed and forgotten, a factory reset via the recessed reset button restores the original label-printed credentials.

Verification history (1)

Every time we've checked this model's default credentials, oldest first — including when nothing changed. Absence of change over time is itself the evidence.

  1. 2026-09-28First verified· label-unique
    source →
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