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Exhibit 21.1

MasTec, Inc.
SUBSIDIARIES OF MASTEC, INC.
December 31, 2024
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, LLCWisconsin
A-1 Express Trucking, LLCWisconsin
A1 Traffic Control & Safety, LLCColorado
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, LLCArizona
Belvidere Stone, LLCIllinois
Bianchi Electric, LLCDelaware
Biggs Construction Company, Inc.Virginia
Bottom Line Services, LLCDelaware
Broadband Access Services, Inc.New Hampshire
Byers Engineering Company
Byers Technical Services, Inc.
Georgia
C&T Insurance CompanyVermont
Casey Industrial, Inc.Oregon
Cash Construction Company, Inc.Texas
CCM Investment Holding Co.Florida
CE&I Services, LLCFlorida
Church & Tower, Inc.Florida
CIDE Engenharia, Ltda.Brazil
CJ 320, LLCArizona
Condotte – Ryan JVFlorida
Condotte America Industrial Properties, LLCFlorida
Condotte America Properties, LLCFlorida
Condotte de Moya JVFlorida
Confluence Networks, LLCFlorida
Consolidated Construction Solutions I, LLCDelaware
Consolidated Construction Solutions II, LLCDelaware
Decisive Communications, Inc.Maryland
DPK, LLCDelaware
East State Stone, LLCDelaware
EC Source Services, LLCFlorida
ECS West, LLCFlorida
Energy Erectors, Inc.Florida


Environmental and Dewatering Solutions, LLCFlorida
Environmental Contractors, LLCIllinois
Florence 80, LLCArizona
FNF Construction, Inc.Arizona
FNF New Mexico, LLCNew Mexico
Foothills Energy Services, Inc.Colorado
Forest City Logistics, LLCDelaware
GGI Constructors JVFlorida
H&M Shared Services, Inc.Pennsylvania
H.B. White Canada Corp.Canada
Hanging H Companies, LLCColorado
Henkels & McCoy Holdings, Inc.Pennsylvania
Henkels & McCoy West, LLCFlorida
Henkels & McCoy, Inc.Pennsylvania
HMSS Realty Co., LLCPennsylvania
IEA Constructors, LLC
IEA Renewable Energy, Inc.
Wisconsin
IEA Energy Services, LLCDelaware
IEA Engineering North Carolina, LLCNorth Carolina
IEA Engineering, LLCMichigan
IEA Equipment Management, LLCDelaware
IEA Intermediate Holdco, LLCDelaware
IEA Management Services, Inc.Delaware
Illinois CCDD Operating Co., LLCIllinois
Infrastructure and Energy Alternatives, Inc.
M III Acquisition Corp.
Delaware
Infrastructure Development Holdings, Inc.Arizona
Infrastructure Holdings CorporationDelaware
Intren West, LLCFlorida
Intren, LLC
L2 Construction Management Solutions
Trench-It
Illinois
John's Stone, LLCDelaware
Johnston Quarry Holdings, LLCDelaware
JRD Texas, LLC
Maslonka Powerline Services
Texas
Kingsley Constructors, Inc.Texas
Lemartec CorporationFlorida
Lemartec PR CorporationPuerto Rico
Lemartec USVI, Inc.U.S. Virgin Islands
MasTec Brasil S/ABrazil
MasTec Brazil I, Inc.Florida
MasTec Brazil II, Inc.Florida
MasTec Canada Inc.Canada
MasTec Canadian Holdco Inc.Canada
MasTec Caribbean KY, LtdCaymans


MasTec Caribbean PR, LLCPuerto Rico
MasTec Civil Constructors, LLCFlorida
MasTec Civil, LLCFlorida
MasTec Comanche, LLCFlorida
MasTec Condotte Holdings, LLCFlorida
MasTec Engineering Corp.Michigan
MasTec ETS Service Company, LLCFlorida
MasTec Foreign Holdings, LLCFlorida
MasTec India Holdings, LLCFlorida
MasTec Industrial Corp.Florida
MasTec Infraestructuras de Mexico, S. de R.L. de C.V.Mexico
MasTec Infrastructure Holdings, LLCFlorida
MasTec International, LLCFlorida
MasTec Latin America Holdings, LLCDelaware
MasTec Latin America, Inc.Delaware
MasTec Mexico Foreign Holdings, LLCFlorida
MasTec Network Services Colombia S.A.S.Colombia
MasTec Network Solutions Puerto Rico, Inc.Puerto Rico
MasTec Network Solutions, Inc.Florida
MasTec Network Solutions, LLCFlorida
MasTec North America, Inc.Florida
MasTec Nsoro Procurement Company, LLCFlorida
MasTec Participacoes Do Brasil LTDABrazil
MasTec Philippines, LLCFlorida
MasTec Pipeline Holdings, LLCFlorida
MasTec Property Holdings, LLCNevada
MasTec Puerto Rico Holdings, LLCPuerto Rico
MasTec Quadgen Wireless, LLPIndia
MasTec Renewables Construction Company, Inc.Florida
MasTec Renewables Puerto Rico, LLCPuerto Rico
MasTec Services Company, Inc.Florida
MasTec Solutions Puerto Rico, LLCPuerto Rico
MasTec Spain, Inc.Florida
MasTec TPP, LLCFlorida
MasTec Utility Services, LLCFlorida
MasTec Venezuela, Inc.Florida
MasTec West, LLCDelaware
MasTec Wireless Services, LLCFlorida
MBS Investors, LLCPennsylvania
MCC Investment and Holdings, LLCFlorida
Meadow Valley Trucking, Inc.Nevada
MNS South, LLCFlorida
MP Drilling Holdings, LLCFlorida
MSTEC Enterprises MexicoMexico
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
MTZ Purnell, Inc.Canada
Mulford Stone, LLCDelaware
NALL Communications, LLCWashington
New A-1 Express, LLCTexas
New A-1 Power, LLCWisconsin
New Stout Excavating Group Texas, LLCTexas
New Stout Excavating Group, LLCWisconsin
Nsoro MasTec International, Inc.Nevada
Phoenix Industrial, Inc.Washington
Porter Brothers, LLCIllinois
Porter's Stone, LLCDelaware
Precision Acquisition, LLCWisconsin
Precision Aggregate Products, LLCNevada
Precision Dewatering, LLCFlorida
Precision Engineering Solutions, LLCFlorida
Precision Fabrication Services, LLCFlorida
Precision Infrastructure, LLCFlorida
Precision Pipeline, LLCWisconsin
Precision Transport Company, LLCWisconsin
Precision West, LLCFlorida
Pretec Directional Drilling, LLCFlorida
Pumpco, Inc.Texas
Purnell Energy Services, Ltd.Canada
Quadgen Wireless Solutions, Inc.Delaware
R&J Leasing, Inc.New Hampshire
R.J. Carroll Company, LLCTexas
Ragnar Benson, LLCIllinois
Rhino Cable Services, Inc.Pennsylvania
Rockford Blacktop Construction Co., LLCIllinois
Saiia Construction Company, LLCDelaware
Saiia Holdings, LLCDelaware
SEFNCO Communications, Inc.Washington
Sequoia Utility Services, LLC Florida
Shade Tree Service CompanyMissouri
Stout Construction, LLCWisconsin
Stout Trucking, LLCWisconsin
Structors, Inc.Illinois
Support Operations Services, LLCFlorida
SUS Holdings, LLCFlorida
T & D Power, Inc.Nevada
Thornton 40, LLCArizona
Three Phase Line Construction, Inc.New Hampshire


Three-Way 28, LLCArizona
Union Real Estate, LLCIllinois
Utility Services Group West, LLCFlorida
Wanzek Construction, Inc.North Dakota
White Construction Energy Services, LLCDelaware
White Construction, LLCIndiana
William Charles Construction Company, LLCIllinois
William Charles Electric, LLCDelaware
William Charles Purchasing, Inc.Illinois
William Charles, Inc.Nevada
WYCO Field Services, LLCWyoming