ZyXEL Communications Prestige P-870HW-51a v2 - Manual (Page 199)

Appendix A Setting Up Your Computer’s IP Address
P-870HW-51a v2 User’s Guide
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In the Command Prompt window, type "ipconfig" and then press [ENTER].
You can also go to Start > Control Panel > Network Connections, right-click a
network connection, click Status and then click the Support tab to view your IP
address and connection information.