Name of Subsidiary

State and/or Country of Incorporation or Organization

Zayo Group Australia Pty. Ltd.

Australia

Zayo Infrastructure Belgium NV

Belgium

Allstream Business Inc.

Canada

Zayo Canada Inc.

Canada

Serenisys SARL*

France

Zayo France SAS

France

Zayo Group France SAS

France

Zayo Infrastructure France SA*

France

Zayo Enterprise France SASU

France

Zayo Infrastructure Deutschland GmbH

Germany

Zayo Group (HK) Limited

Hong Kong

Emerald Bridge Fibres Limited*

Ireland

Zayo Infrastructure Ireland Limited

Ireland

Zayo Italy S.r.l.

Italy

MFN Japan KK

Japan

Zayo Infrastructure Nederland B.V.

Netherlands

Zayo Singapore Pte. Ltd.

Singapore

Zayo Group South Africa (Pty) Ltd.

South Africa

Zayo Infrastructure Spain, S.L.

Spain

Zayo Infrastructure Switzerland AG

Switzerland

FibreSpeed Limited

United Kingdom

Zayo Corporate UK Limited

United Kingdom

Zayo Group International Limited

United Kingdom

Zayo Group UK Limited

United Kingdom

Electric Lightwave, LLC

United States, Delaware

Zayo Capital, Inc.

United States, Delaware

Zayo Group, LLC

United States, Delaware

Zayo Professional Services, LLC

United States, Delaware

Allstream Business US, LLC

United States, Oregon

Zayo Group Latin America, LLC

United States, Delaware

Zayo Infrastructure Mexico S. DE R.L. DE C.V.

Mexico

Northeastern ITS LLC

United States, Pennsylvania

Zayo Brazil Holdings LTDA

Brazil

Zayo Infrastructure Brazil LTDA

Brazil