Nintendo 3ds Serial Number Lookup Page

The serial number is printed in two places on every 3DS unit:

Important note: The serial number is not displayed within the system settings or on any on-screen menu. You must physically read it from the device or its box. Nintendo 3ds Serial Number Lookup

You cannot perform a lookup if you cannot find the number. Unlike the Switch, the 3DS serial number appears in three distinct locations. The serial number is printed in two places

When selling on r/hardwareswap or Facebook Marketplace, include a photo of the serial number (with the last 3 digits blurred for privacy). This proves: Important note: The serial number is not displayed

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Solution: Call Nintendo with the serial and police report. Without police report, Nintendo won’t flag it. They also cannot locate it.