SpotPass
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SpotPass is a Nintendo 3DS feature that allows the 3DS to automatically download content, notifications, and software when it's in standby mode. Software downloaded with SpotPass is stored on SD card.
SpotPass Internet communications are mostly small UDP frames and HTTPS transfers, the only HTTP download is the connection test page.
With the 2.0.0-2 update, SpotPass now regularly requests content over HTTPS from nppl.c.app.nintendowifi.net and sometimes nasc.nintendowifi.net. These are probably related to the automatic system updates/SpotPass automatic software download functionality. Going by the domain names, nppl* might be for SpotPass software downloads, while nasc* might be for auto updates?(Not confirmed yet)