NPORT-P false 0000276463 XXXXXXXX S000004071 C000011389 C000037618 C000011387 C000052631 C000011390 C000037621 C000011391 C000037620 C000052630 BlackRock Bond Fund, Inc. 811-02857 0000276463 54930030AVOSLSPZTH36 100 Bellevue Parkway Wilmington 19809 800-441-7762 BlackRock Total Return Fund S000004071 549300WQF7SM1NEFDT68 2020-09-30 2020-03-31 N 16321291127.23 66540577.62 16254750549.61 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 17760662.28000000 N Master Total Return Portfolio BYCPUE5REOJMYJVG3O25 000000000 16304807333.97000000 NS USD 16304807333.97000000 100.3079517228 Long EC CORP US N N/A N N N 2020-05-21 BlackRock Bond Fund, Inc. Ann Frechette Ann Frechette Assistant Treasurer