Exhibit 21.1

MasTec, Inc.

SUBSIDIARIES OF MASTEC, INC.

December 31, 2023

Following is a listing of subsidiaries of MasTec, Inc., which includes the name of the subsidiary, as well as any name under which the subsidiary does business (in italics), and the subsidiary's related jurisdiction of incorporation or organization. Certain subsidiaries have been omitted given that such subsidiaries, individually or in the aggregate, would not constitute a significant subsidiary.

A-1 Excavating, LLC	Wisconsin
A-1 Express Trucking, LLC	Wisconsin
A1 Traffic Control & Safety, LLC	Colorado
Acietel Mexicana, S.A.	Mexico
Aidco de Mexico, S.A. de C.V.	Mexico
American Civil Constructors West Coast, LLC ACC West Coast	California
American Civil Constructors, LLC ACC Mountain West	Colorado
Bakken Aggregates, LLC	Arizona
Belividere Stone, LLC	Illinois
Bianchi Electric, LLC	Indiana
Bottom Line Services, LLC	Delaware
Broadband Access Services, Inc.	New Hampshire
Byers Engineering Company Byers Technical Services, Inc.	Georgia
C&T Insurance Company	Vermont
Casey Industrial, Inc.	Oregon
Cash Construction Company, Inc.	Texas
CCM Investment Holding Co.	Florida
CE&I Services, LLC	Florida
Church & Tower, Inc.	Florida
CIDE Engenharia, Ltda.	Brazil
CJ 320, LLC	Arizona
Clinton RE Holdings (Delaware), LLC	Delaware
Condotte – Ryan JV	Florida
Condotte America Industrial Properties, LLC	Florida
Condotte America Properties, LLC	Florida
Condotte de Moya JV	Florida
Confluence Networks, LLC	Florida
Consolidated Construction Solutions I LLC	Delaware
Consolidated Construction Solutions II LLC	Delaware
Decisive Communications, Inc.	Maryland
DPK, LLC	Illinois
East State Stone, LLC	Delaware
EC Source Services, LLC	Florida
ECS West, LLC	Florida
Energy Erectors, Inc.	Florida

Environmental and Dewatering Solutions, LLC	Florida
Environmental Contractors, LLC	Illinois
Florence 80, LLC	Arizona
FNF Construction, Inc.	Arizona
FNF New Mexico, LLC	New Mexico
Foothills Energy Services, Inc.	Colorado
Forest City Logistics, LLC	Delaware
GGI Constructors JV	Florida
H&M Shared Services, Inc.	Pennsylvania
Hanging H Companies, LLC	Colorado
Henkels & McCoy Holdings, Inc.	Pennsylvania
Henkels & McCoy West, LLC	Florida
Henkels & McCoy, Inc.	Pennsylvania
HMSS Realty Co., LLC	Pennsylvania
IEA Constructors, LLC	Wisconsin
IEA Energy Services, LLC	Delaware
IEA Engineering North Carolina, LLC	North Carolina
IEA Engineering, LLC	Michigan
IEA Equipment Management, LLC IEA Equipment Management, Inc.	Delaware
IEA Intermediate Holdco, LLC	Delaware
IEA Management Services, Inc.	Delaware
IEA Solar Devco, LLC	Delaware
Illinois CCDD Operating Co, LLC	Illinois
Infrastructure and Energy Alternatives, Inc.	Delaware
Infrastructure Development Holdings, Inc.	Arizona
Infrastructure Holdings Corporation	Delaware
Intren West, LLC	Florida
Intren, LLC L2 Construction Management Solutions Trench-It	Illinois
John's Stone, LLC	Delaware
Johnston Quarry Holdings, LLC	Delaware
JRD Texas, LLC Maslonka Powerline Services	Texas
Kingsley Constructors, Inc.	Texas
Lemartec Corporation	Florida
Lemartec PR Corporation	Puerto Rico
Lemartec USVI, Inc.	U.S. Virgin Islands
MasTec (Mauritius) Limited	Mauritius
MasTec Brasil S/A	Brazil
MasTec Brazil I, Inc.	Florida
MasTec Brazil II, Inc.	Florida
MasTec Canada, Inc.	Canada
MasTec Canadian Holdco, Inc.	Canada
MasTec Civil Constructors, LLC	Florida

MasTec Civil, LLC	Florida
MasTec Comanche, LLC	Florida
MasTec Condotte Holdings, LLC	Florida
MasTec Cooperatief (UA)	Netherlands
MasTec Engineering Corp.	Michigan
MasTec Equipment, Inc.	Florida
MasTec ETS Service Company, LLC	Florida
MasTec Foreign Holdings, LLC	Florida
MasTec India Holdings, LLC	Florida
MasTec Industrial Corp.	Florida
MasTec Infraestructuras de Mexico, S. de R.L. de C.V.	Mexico
MasTec Infrastructure Holdings, LLC	Florida
MasTec International, LLC	Florida
MasTec Latin America Holdings, LLC	Delaware
MasTec Latin America, Inc.	Delaware
MasTec Mexico Foreign Holdings, LLC	Florida
MasTec Mexico Holding Company, LLC	Florida
MasTec Network Services Colombia S.A.S.	Colombia
MasTec Network Solutions Puerto Rico, Inc.	Puerto Rico
MasTec Network Solutions, Inc.	Florida
MasTec Network Solutions, LLC	Florida
MasTec North America, Inc.	Florida
MasTec Nsoro Procurement Company, LLC	Florida
Mastec Participacoes Do Brasil LTDA	Brazil
MasTec Pipeline Holdings, LLC	Florida
MasTec Property Holdings, LLC	Nevada
MasTec Puerto Rico Holdings, LLC	Puerto Rico
MasTec Quadgen Wireless LLP	India
MasTec Renewables Construction Company, Inc.	Florida
MasTec Renewables Puerto Rico, LLC	Puerto Rico
MasTec Services Company, Inc.	Florida
MasTec Solutions Puerto Rico, LLC	Puerto Rico
MasTec Spain, Inc.	Florida
MasTec TPP, LLC	Florida
MasTec Utility Services, LLC	Florida
MasTec Venezuela, Inc.	Florida
MasTec West, LLC	Delaware
MBS Investors, LLC	Pennsylvania
MCC Investment and Holdings, LLC	Florida
Meadow Valley Corporation	Nevada
Meadow Valley Parent Corp.	Delaware
Meadow Valley Trucking, Inc.	Nevada
MNS South, LLC	Florida
MP Drilling Holdings, LLC	Florida
MSTEC Enterprises Mexico	Mexico

MTCO Energias de Mexico, S. de R.L. de C.V.	Mexico
MTZ Energias S. de R.L. de C.V.	Mexico
MTZ Enterprises, S. de R.L. de C.V.	Mexico
Mulford Stone, LLC	Delaware
NAL Communications, LLC	Washington
New A-1 Express, LLC	Texas
New A-1 Power, LLC	Wisconsin
New Stout Excavating Group Texas, LLC	Texas
New Stout Excavating Group, LLC	Wisconsin
Nsoro MasTec (Mauritius) Limited	Mauritius
Nsoro MasTec India Private, Ltd.	India
Phoenix Industrial, Inc.	Washington
Porter Brothers, LLC	Illinois
Porter's Stone, LLC	Delaware
Precision Acquisition, LLC	Wisconsin
Precision Aggregate Products, LLC	Nevada
Precision Dewatering, LLC	Florida
Precision Engineering Solutions, LLC	Florida
Precision Fabrication Services, LLC	Florida
Precision Infrastructure, LLC	Florida
Precision Pipeline LLC	Wisconsin
Precision Transport Company, LLC	Wisconsin
Precision West, LLC	Florida
Pretec Directional Drilling LLC	Florida
Pumpco, Inc.	Texas
Quadgen Wireless Solutions, Inc.	Delaware
R&J Leasing, Inc.	New Hampshire
R.J. Carroll Company, LLC	Texas
Ragnar Benson, LLC	Illinois
Rhino Cable Services, Inc.	Pennsylvania
Rockford Blacktop Construction Co, LLC	Illinois
Saiia Construction Company, LLC	Delaware
Saiia Holdings LLC	Delaware
SEFNCO Communications, Inc.	Washington
Shade Tree Service Company	Missouri
Stout Construction, LLC	Wisconsin
Stout Trucking, LLC	Wisconsin
Structors, Inc.	Illinois
Support Operations Services, LLC	Florida
T & D Power, Inc.	Nevada
Thornton 40, LLC	Arizona
Three Phase Line Construction, Inc.	New Hampshire
Three-Way 28, LLC	Arizona
Union Real Estate, LLC	Illinois

Utility Services Group West, LLC	Florida
Wanzek Construction, Inc.	North Dakota
White Construction Energy Services LLC	Delaware
White Construction, LLC White Construction Inc.	Indiana
William Charles Construction Company, LLC	Illinois
William Charles Electric, LLC	Idaho
William Charles Purchasing, Inc.	Illinois
William Charles, Inc.	Nevada
WYCO Field Services, LLC	Wyoming