EX-21.1 8 rbbn-20251231xex21d1.htm EX-21.1

EXHIBIT 21.1

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RIBBON COMMUNICATIONS INC.

SUBSIDIARIES OF THE REGISTRANT

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Name | Jurisdiction of Incorporation
ECI de Argentina S.A. | Argentina
Ribbon Communications Australia Pty Ltd | Australia
Ribbon Communications do Brasil Ltda. | Brazil
Ribbon Communications Canada ULC | Canada
Ribbon Networks Communications Chile Limitada | Chile
Ribbon Communications Shanghai Co., Ltd. | China
Ribbon Communications Shanghai Co., LTD Hangzhou Branch | China
Ribbon Communications Sur America Ltda. | Colombia
Ribbon Communications Costa Rica S.A. | Costa Rica
Ribbon Communications Czech Republic s.r.o. | Czech Republic
Ribbon Communications France EURL | France
Ribbon Communications Germany GmbH | Germany
Ribbon Communications Hong Kong Limited | Hong Kong
Ribbon Communication Pvt. Ltd. | India
ECI Telecom India Private Limited | India
Ribbon Communications International Ltd. | Ireland
Ribbon Communications Israel Ltd. | Israel
ECI Telecom Group Ltd. | Israel
ECI Telecom Ltd. | Israel
Negev Telecom Ltd. | Israel
Ribbon Communications Italy S.R.L. | Italy
Ribbon Communications Kabushiki Kaisha | Japan
ECI Telecom Kenya Limited | Kenya
Ribbon Communications Malaysia Sdn. Bhd. | Malaysia
Ribbon Communications Mexico S. de R.L. de C.V. | Mexico
GENBAND Canada B.V. | Netherlands
Ribbon Networks B.V. | Netherlands
GENBAND NS B.V. | Netherlands
Ribbon Communications B.V. | Netherlands
Ribbon Communications Philippines, Inc. | Philippines
Ribbon Communications sp.z.o.o. | Poland
Ribbon Communications Rus Limited Liability Company | Russia
ECI Telecom 2005 LLC | Russia
Ribbon Networks Saudi Arabia for Information Technology | Saudi Arabia
Ribbon Communications Singapore Pte. Ltd. | Singapore
Ribbon Communications Spain, S.L. | Spain
Ribbon Communications Switzerland GmbH | Switzerland
Ribbon Networks Co., Ltd. | Taiwan
Ribbon Communications Operating Company, Inc. (Thailand Branch) | Thailand
Ribbon Networks B.V. Dubai Branch | UAE
Ribbon Communications UK Limited | UK
ECI Telecom Ukraine LLC | Ukraine
N.E.T. APLA, Inc. – Uruguay Branch | Uruguay

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Name | Jurisdiction of Incorporation
Network Equipment Technologies, Inc. | US; Delaware
Ribbon Communications Operating Company, Inc. | US; Delaware
Ribbon Communications Federal Inc. | US; Delaware
Sonus Networks, Inc. | US; Delaware
Genband Inc. | US; Massachusetts
ECI Telecom Holdings B.V. Vietnam Rep. Office | Vietnam
The Representative Office of Ribbon Networks B.V. in Hanoi City | Vietnam

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