Exhibit 21.1

SUBSIDIARIES OF THE REGISTRANT

Global Telecom & Technology Americas, Inc., a Virginia corporation

GTT — EMEA Ltd., a United Kingdom corporation

GTT Global Telecom Government Services, LLC, a Virginia limited liability company

Global Telecom & Technology SARL (formerly called European Telecommunications & Technology
SARL), a French corporation

European Telecommunications & Technology Inc., a Delaware corporation

Global Telecom & Technology Deutschland GmbH (formerly called ETT European Telecommunications
& Technology Deutschland GmbH), a German corporation

ETT (European Telecommunications & Technology) Private Limited, an Indian corporation

European Telecommunications & Technology (S) Pte Limited, a Singapore corporation

ETT Network Services Limited, a United Kingdom corporation

WBS Connect LLC, a Colorado limited liability company

TEK Channel Consulting, LLC, a Colorado limited liability company

WBS Connect Europe, Ltd., a company formed under the laws of Ireland