Exhibit 99.1350CERT

Certification Pursuant to Rule 30a-2(b) under the 1940 Act and
Section 906 of the Sarbanes Oxley Act

Pursuant to 18 U.S.C. § 1350, the undersigned officer of BIF Government Securities Fund and Master Government
Securities LLC (the “registrants”), hereby certifies, to the best of his knowledge, that the registrants' Report on Form
N-CSR for the period ended March 31, 2011 (the “Report”) fully complies with the requirements of Section 15d of
the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in
all material respects, the financial condition and results of operations of the registrants.

Date: June 3, 2011

John M. Perlowski
John M. Perlowski
Chief Executive Officer (principal executive officer) of
BIF Government Securities Fund and Master Government Securities LLC

Pursuant to 18 U.S.C. § 1350, the undersigned officer of BIF Government Securities Fund and Master Government
Securities LLC (the “registrants”), hereby certifies, to the best of his knowledge, that the registrants' Report on Form
N-CSR for the period ended March 31, 2011 (the “Report”) fully complies with the requirements of Section 15d of
the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in
all material respects, the financial condition and results of operations of the registrants.

Date: June 3, 2011

/S/ Neal J. Andrews
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BIF Government Securities Fund and Master Government Securities LLC

This certification is being furnished pursuant to Rule 30a-2(b) under the Investment Company Act of 1940, as
amended, and 18 U.S.C. Section 1350 and is not being filed as part of the Form N-CSR with the Securities and
Exchange Commission.