The serial number can be located on the bottom panel of the unit and in the Web Management interface of the SBR-AC1750.  This document includes the following sections:
Locating the Serial Number on the Bottom Panel
The serial number can be located on a white sticker on the bottom of the device.Â
Locating the Serial Number in the Web Management Interface
- Launch a web browser, such as Internet Explorer, Firefox, or Safari.  Enter http://192.168.0.1 into the address box, and press the Enter key. The Login page appears.
NOTE: By default the LAN IP address is 192.168.0.1. If the default address has been changed, enter the custom address in the address box.
 - On the Login page:
a.  Enter password in the Password field.
b.   Click the Login button. The Home page appears.
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 - Move the mouse-cursor to the UTILITIES and select System Information from the drop-down submenu. The UTILITIES - System Information page appears.
- The serial number will be displayed (as shown below).