Exhibit 21.1
| Subsidiaries of the Registrant |
State/Country of Incorporation or Organization | |
| Latisys SPV, Inc. |
California | |
| AboveNet Communications, LLC |
Delaware | |
| FiberNet Telecom, Inc. |
Delaware | |
| Latisys-Ashburn, LLC |
Delaware | |
| Latisys-Ashburn Holdings Corp. |
Delaware | |
| Latisys-Chicago, LLC |
Delaware | |
| Latisys-Chicago Holdings Corp. |
Delaware | |
| Latisys Corp. |
Delaware | |
| Latisys-Denver, LLC |
Delaware | |
| Latisys Holdings Corp. |
Delaware | |
| Latisys-Irvine, LLC |
Delaware | |
| Latisys-Irvine Properties, LLC |
Delaware | |
| Neo Telecoms LLC |
Delaware | |
| USCarrier, LLC |
Delaware | |
| Zayo Capital, Inc. |
Delaware | |
| Zayo Colocation, LLC |
Delaware | |
| Zayo Corelink Acquisition Sub, LLC |
Delaware | |
| Zayo Group, LLC |
Delaware | |
| Zayo Professional Services, LLC |
Delaware | |
| Colo Facilities Atlanta, LLC |
Georgia | |
| FiberLink, LLC |
Illinois | |
| IdeaTek Systems, Inc. |
Kansas | |
| Access Communications, Inc. |
Minnesota | |
| Local Fiber, LLC |
New York | |
| 360networks Vancouver Ltd. |
Canada | |
| AboveNet Canada, Inc. |
Canada | |
| Intexan SARL |
France | |
| Neo Telecom Group SAS |
France | |
| NeoClyde SAS |
France | |
| Serenisys SARL |
France | |
| Zayo France SAS |
France | |
| Emerald Bridge Fibre Limited |
Ireland | |
| MFN Japan KK |
Japan | |
| Ego Acquisitions Limited |
United Kingdom | |
| Ego Holdings Limited |
United Kingdom | |
| Ego Midco Limited |
United Kingdom | |
| FibreSpeed Limited |
United Kingdom | |
| Geo Metro Limited |
United Kingdom | |
| Geo Networks Limited |
United Kingdom | |
| Zayo Group EU Limited |
United Kingdom | |
| Zayo Group International Limited |
United Kingdom | |
| Zayo Group UK Limited |
United Kingdom |