Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Sam Heidari, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report on Form 10-K of Quantenna Communications, Inc. for the fiscal year ended December 30, 2018 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Annual Report on Form 10-K fairly presents, in all material respects, the financial condition and results of operations of Quantenna Communications, Inc.

Date:	February 28, 2019	By:	/s/ Sam Heidari
		Name:	Sam Heidari
		Title:	Chief Executive Officer (Principal Executive Officer)

I, Sean Sobers, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report on Form 10-K of Box, Inc. for the fiscal year ended December 30, 2018 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Annual Report on Form 10-K fairly presents, in all material respects, the financial condition and results of operations of Quantenna Communications, Inc.

Date:	February 28, 2019	By:	/s/ Sean Sobers
		Name:	Sean Sobers
		Title:	Chief Financial Officer (Principal Financial Officer)