What if the default management IP address of the GS1900 switch has been changed and I forget it?

Zyxel_StevenSu

If the management IP address has been changed and forgotten, you can use the Zyxel Network Orchestrator (ZON) Utility to find the switch’s IP address. This tool helps in identifying and managing Zyxel devices on the network.

Here is the ZON download link: Zyxel ONE Network Utility | Zyxel Networks