Exhibit 21.1
List of Subsidiaries of Valaris Limited
| Name | State or Other Jurisdiction of Incorporation or Organization | |
| Alpha Achiever Company | Cayman Islands | |
| Alpha Admiral Company | Cayman Islands | |
| Alpha Archer Company | Cayman Islands | |
| Alpha Aurora Company | Cayman Islands | |
| Alpha Falcon Company | Cayman Islands | |
| Alpha Falcon Drilling Company | Cayman Islands | |
| Alpha Int’l Drilling Company S.à r.l | Luxembourg | |
| Alpha Leasing Drilling Limited | Mauritius | |
| Alpha Mako Company | Cayman Islands | |
| Alpha Manta Company | Cayman Islands | |
| Alpha Offshore Drilling (S) Pte Ltd. | Singapore | |
| Alpha Offshore Drilling Services Company | Cayman Islands | |
| Alpha Offshore Drilling Services Company (Ghana) Limited | Ghana | |
| Alpha Offshore Intl Leasing | England and Wales (UK) | |
| Alpha Orca Company | Cayman Islands | |
| Alpha South Pacific Holding Company | Cayman Islands | |
| Atlantic Maritime Services LLC | Delaware (USA) | |
| Atwood Advantage S.à r.l | Luxembourg | |
| Atwood Australian Waters Drilling Pty Limited | Australia | |
| Atwood Beacon S.à r.l | Luxembourg | |
| Atwood Deep Seas, Ltd. | Texas (USA) | |
| Atwood Drilling LLC | Delaware (USA) | |
| Atwood Hunter LLC | Delaware (USA) | |
| Atwood Malta Holding Company Limited | Malta | |
| Atwood Oceanics (M) Sdn. Bhd. | Malaysia | |
| Atwood Oceanics Australia Pty Limited | Australia | |
| Atwood Oceanics Drilling Mexico SRLCV | Mexico | |
| Atwood Oceanics Global Limited | Cayman Islands | |
| Atwood Oceanics International Limited | Cayman Islands | |
| Atwood Oceanics Leasing Limited | Labuan | |
| Atwood Oceanics LLC | Texas (USA) | |
| Atwood Oceanics Malta Limited | Malta | |
| Atwood Oceanics Management, LLC | Delaware (USA) | |
| Atwood Oceanics Pacific Limited | Cayman Islands | |
| Atwood Oceanics Services Mexico S. de R.L. de C.V | Mexico | |
| Atwood Offshore Drilling Limited | Hong Kong | |
| Atwood Offshore Labor Company | Cayman Islands | |
| Atwood Offshore Worldwide Limited | Cayman Islands | |
| Aurora Offshore Services Gmbh | Germany | |
| C.A. Foravep, Forasol Venezolana de Perforaciones | Venezuela | |
| Clearways Offshore Drilling Sdn. Bhd. | Malaysia | |
| DrillQuest International Offshore Drilling Services Co. | Cayman Islands | |
| DrillQuest Offshore Company | Cayman Islands | |
| Durand Maritime S.A.S. (In Liquidation) | France | |
| ENSCO (Barbados) Limited | Cayman Islands | |
| ENSCO (Bermuda) Limited | Bermuda | |
| Ensco (Myanmar) Limited | Myanmar | |
| Ensco (Thailand) Limited | Thailand | |
| ENSCO Arabia Co. Ltd. | Saudi Arabia |
| ENSCO Asia Company LLC | Texas (USA) | |
| ENSCO Asia Pacific Pte. Limited | Singapore | |
| Ensco Associates Company | Cayman Islands | |
| ENSCO Australia Pty. Limited | Australia | |
| ENSCO Capital Limited | Cayman Islands / United Kingdom | |
| ENSCO Corporate Resources LLC | Delaware (USA) | |
| ENSCO de Venezuela, S.R.L. | Venezuela | |
| Ensco Deepwater Drilling Limited | England and Wales (UK) | |
| ENSCO Deepwater USA II LLC | Delaware (USA) | |
| ENSCO Development Limited | Cayman Islands | |
| Ensco do Brasil Petróleo e Gás Ltda. | Brazil | |
| ENSCO Drilling (Caribbean), Inc. | Cayman Islands | |
| ENSCO Drilling Company (Nigeria) Ltd. | Nigeria | |
| ENSCO Drilling Company LLC | Delaware (USA) | |
| Ensco Drilling I Ltd. | Cayman Islands | |
| ENSCO Drilling Mexico LLC | Delaware (USA) | |
| Ensco Endeavors Limited | Cayman Islands / United Kingdom | |
| Ensco France S.A.S. | France | |
| ENSCO Gerudi (M) Sdn. Bhd. | Malaysia | |
| ENSCO Global GmbH | Switzerland | |
| Ensco Global II Ltd. | Cayman Islands | |
| ENSCO Global Investments LP | England and Wales (UK) | |
| Ensco Global IV Ltd | British Virgin Islands | |
| ENSCO Global Limited | Cayman Islands / United Kingdom | |
| ENSCO Global Resources Limited | England and Wales (UK) | |
| Ensco Holdco Limited | England and Wales (UK) | |
| ENSCO Holding Company | Delaware (USA) | |
| Ensco Holdings I Ltd. | Cayman Islands | |
| Ensco Holdings II Ltd. | Delaware (USA) | |
| Ensco Holdings III LLC | Delaware (USA) | |
| ENSCO Holland B.V. | Netherlands | |
| Ensco Incorporated | Texas (USA) | |
| Ensco Intercontinental GmbH | Switzerland | |
| ENSCO International Incorporated | Delaware (USA) | |
| Ensco International Ltd. | British Virgin Islands / United Kingdom | |
| Ensco International Management GP LLC | Delaware (USA) | |
| Ensco International Management LP LLC | Delaware (USA) | |
| ENSCO Investments LLC | Nevada (USA) / United Kingdom | |
| Ensco Jersey Finance Limited | Jersey / United Kingdom | |
| ENSCO Labuan Limited | Malaysia | |
| ENSCO Limited | Cayman Islands | |
| Ensco Management Corp | British Virgin Islands | |
| ENSCO Maritime Limited | Bermuda | |
| Ensco Mexico Services S.de R.L. | Mexico | |
| Ensco North America LLC | Delaware (USA) | |
| Ensco Ocean 1 Company | Cayman Islands | |
| Ensco Ocean 2 Company | Cayman Islands | |
| ENSCO Oceanics Company LLC | Delaware (USA) | |
| ENSCO Oceanics International Company | Cayman Islands | |
| ENSCO Offshore LLC | Delaware (USA) | |
| ENSCO Offshore International Company | Cayman Islands | |
| ENSCO Offshore International Holdings Limited | Cayman Islands / United Kingdom | |
| ENSCO Offshore International Inc. | Marshall Islands | |
| Ensco Offshore International LLC | Delaware (USA) |
| Ensco Offshore Petróleo e Gás Ltda. | Brazil | |
| Ensco Offshore Services LLC | Delaware (USA) | |
| ENSCO Offshore U.K. Limited | England and Wales (UK) | |
| ENSCO Overseas Limited | Cayman Islands | |
| ENSCO Services Limited | England and Wales (UK) | |
| ENSCO Services LLC | Delaware (USA) | |
| Ensco South Pacific LLC | Delaware (USA) | |
| Ensco Transcontinental I LLC | Nevada (USA) | |
| Ensco Transcontinental II LLC | Nevada (USA) | |
| Ensco Transcontinental II LP | England and Wales (UK) | |
| Ensco Transcontinental LP | England and Wales (UK) | |
| Ensco Transnational I Limited | Cayman Islands | |
| Ensco Transnational II Limited | Cayman Islands | |
| Ensco Transnational III Limited | Cayman Islands | |
| Ensco Transnational Limited | Cayman Islands | |
| ENSCO U.K. Limited | England and Wales (UK) | |
| Ensco UK Drilling Limited | England and Wales (UK) | |
| ENSCO United Incorporated | Delaware (USA) | |
| Ensco Universal Holdings I Ltd. | Cayman Islands / United Kingdom | |
| Ensco Universal Holdings II Ltd. | Cayman Islands / United Kingdom | |
| ENSCO Universal Limited | England and Wales (UK) | |
| Ensco Vistas Limited | Cayman Islands | |
| Ensco Worldwide GmbH | Switzerland | |
| Ensco Worldwide Holdings Ltd. | Cayman Islands | |
| ENSCO Worldwide Investments Lt | England and Wales (UK) | |
| EnscoRowan Ghana Drilling Limited | Ghana | |
| Foradel SDN B.H.D. | Malaysia | |
| Forasub B.V. | Netherlands/ United Kingdom | |
| Forinter Limited | Jersey / United Kingdom | |
| Great White Shark Limited | Gibraltar | |
| Green Turtle Limited | Gibraltar | |
| Inter-Drill Ltd. | Bahamas | |
| International Technical Services LLC | Delaware (USA) | |
| Manatee Limited | Malta | |
| Manta Ray Limited | Malta | |
| Marine Blue Limited | Gibraltar | |
| Ocean Deep Drilling ESV Nigeria Limited | Nigeria | |
| Offshore Drilling Services LLC | Delaware (USA) | |
| P.T. ENSCO Sarida Offshore | Indonesia | |
| Pacific Offshore Labor Company | Cayman Islands | |
| Petroleum International Pte. Ltd. | Singapore | |
| Pride Arabia Co. Ltd. | Saudi Arabia | |
| Pride Foramer S.A.S. | France | |
| Pride Forasol Drilling Nigeria Ltd. | Nigeria | |
| Pride Forasol S.A.S. | France | |
| Pride Global II Ltd | British Virgin Islands | |
| Pride Global Offshore Nigeria Ltd. | Nigeria | |
| Pride International LLC | Delaware (USA) | |
| Pride International Management Co. LP | Texas (USA) | |
| PT Alpha Offshore Drilling | Indonesia | |
| PT Pentawood Offshore Drilling | Indonesia | |
| Ralph Coffman Cayman Limited | Cayman Islands | |
| Ralph Coffman Limited | Gibraltar | |
| Ralph Coffman Luxembourg S.à r.l. | Luxembourg |
| RCI International, Inc. | Cayman Islands | |
| RD International Services Pte. Ltd. | Singapore | |
| RDC Arabia Drilling, Inc. | Cayman Islands | |
| RDC Holdings Luxembourg S.à r.l. | Luxembourg | |
| RDC Malta Limited | Malta | |
| RDC Offshore Luxembourg S.à r.l. | Luxembourg | |
| RDC Offshore Malta Limited | Malta | |
| RoCal Cayman Limited | Cayman Islands | |
| Rowan 240C#3, Inc. | Cayman Islands | |
| Rowan 350 Slot Rigs, LLC | Delaware (USA) | |
| Rowan Angola Limitada | Angola | |
| Rowan California S.à r.l. | Luxembourg | |
| Rowan Cayman Limited | Cayman Islands | |
| Rowan Companies Limited | England and Wales (UK) | |
| Rowan Companies, LLC | Delaware (USA) | |
| Rowan Deepwater Drilling (Gibraltar) Limited | Gibraltar | |
| Rowan do Brasil Serviços de Perfuração Ltda. | Brazil | |
| Rowan Drilling (Gibraltar) Limited | Gibraltar | |
| Rowan Drilling (Trinidad) Limited | Cayman Islands | |
| Rowan Drilling (U.K.) Limited | Scotland (UK) | |
| Rowan Drilling Cyprus Limited | Cyprus | |
| Rowan Drilling S. de R.L. de C.V | Mexico | |
| Rowan Drilling Services Limited | Gibraltar | |
| Rowan Drilling Services Nigeria Limited | Nigeria | |
| Rowan Egypt Petroleum Services LLC | Egypt | |
| Rowan Finance LLC | Delaware (USA) | |
| Rowan Financial Holdings S.à r.l. | Luxembourg | |
| Rowan Finanz S.à r.l. | Luxembourg | |
| Rowan Global Drilling Services Limited | Gibraltar | |
| Rowan Holdings Luxembourg S.à r.l. | Luxembourg | |
| Rowan International Rig Holdings S.à r.l. | Luxembourg | |
| Rowan Marine Services LLC | Texas (USA) | |
| Rowan Middle East, Inc. | Cayman Islands | |
| Rowan N-Class (Gibraltar) Limited | Gibraltar | |
| Rowan No. 1 Limited | England and Wales (UK) | |
| Rowan No. 2 Limited | England and Wales (UK) | |
| Rowan North Sea, Inc. | Cayman Islands | |
| Rowan Norway Limited | Gibraltar | |
| Rowan Offshore (Gibraltar) Limited | Gibraltar | |
| Rowan Offshore Luxembourg S.à r.l. | Luxembourg | |
| Rowan Relentless Luxembourg S.à r.l. | Luxembourg | |
| Rowan Reliance Luxembourg S.à r.l. | Luxembourg | |
| Rowan Renaissance Luxembourg S.à r.l. | Luxembourg | |
| Rowan Resolute Luxembourg S.à r.l. | Luxembourg | |
| Rowan Rex Limited (Cayman) | Cayman Islands | |
| Rowan Rigs S.à r.l. | Luxembourg | |
| Rowan S. de R.L. de C.V. | Mexico | |
| Rowan Services LLC | Delaware (USA) | |
| Rowan Standard Ghana Limited | Ghana | |
| Rowan US Holdings (Gibraltar) Limited | Gibraltar | |
| Rowandrill Labuan Limited | Malaysia | |
| Rowandrill, LLC | Texas (USA) | |
| Rowandrill Malaysia Sdn. Bhd | Malaysia | |
| Saudi Aramco Rowan Offshore Drilling Company | Saudi Arabia |
| SKDP 1 Limited | Cyprus | |
| SKDP 2 Limited | Cyprus | |
| SKDP 3 Limited | Cyprus | |
| Societe Maritime de Services SOMASER S.A.S. | France | |
| Sonamer Angola Ltd. | Bahamas / United Kingdom | |
| Sonamer Drilling International Ltd. | Bahamas | |
| Sonamer Jack-Ups Ltd. | Bahamas | |
| Sonamer Limited | Bahamas / United Kingdom | |
| Sonamer Perfuracoes Ltd. | Bahamas | |
| Swiftdrill Malta | Malta | |
| Swiftdrill Offshore Drilling Services Co | Cayman Islands | |
| Valaris Holdco 1 Limited | Bermuda | |
| Valaris Holdco 2 Limited | Bermuda | |
| Valaris Holdings 1 | Cayman Islands | |
| Valaris Holdings 2 | Cayman Islands | |
| Valaris Holdings 3 | Cayman Islands | |
| Valaris plc | United Kingdom |