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Forum Discussion
Wifi security code for Model No. R6400-100NAS
Netgear AC1750 SMART WIFI ROUTER 802.11ac Dual Band Gigabits
Look at the label on the R6400. This has the default wifi SSID and "Passphrase".
Maybe that is what you mean by "Wifi security code". That is not a label that appears in any Netgear manual.