Exhibit 21.01

Subsidiaries of the Registrant

DOMESTIC SUBSIDIARIES

CORPORATIONS

225 Old NB Road Inc. 226 Old NB Road, Corp. Advanced Data Services, Inc. American Shale Oil Corporation Beltway Acquisition Corporation, d/b/a WMET CTM Media Group, Inc. Dipchip Corp. Entrix Telecom, Inc. IDT America, Corp. IDT Capital, Inc. IDT Carmel, Inc. IDT Domestic Telecom, Inc., NJ d/b/a Mobiltalker IDT Energy, Inc. IDT International Telecom, Inc. IDT Internet Mobile Group, Inc., NJ d/b/a Zedge Studio IDT Investments Inc. IDT Spectrum, Inc. IDT Telecom, Inc. IDT Wireless, Inc. Net2Phone, Inc. Zedge Holdings, Inc.

DOMESTIC SUBSIDIARIES

LIMITED LIABILITY COMPANIES

American Shale Oil, LLC, Assumed name in Texas: AMSO, LLC Ethnic Grocery Brands LLC Hillview Avenue Realty, LLC Idea and Design Works LLC. IDT Advanced Communication Services, LLC IDT Domestic Union, LLC IDT Financial Services, LLC LTP Wireless 2, LLC Net2Phone Cable Telephony, LLC Net2Phone Global Services, LLC PICUP, LLC Tuyo Mobile, LLC Union Telecard Alliance, LLC

FOREIGN SUBSIDIARIES

DirectTel Dutch Holdings B.V. DYP C.V Expercom B.V.B.A. (Belgium) IDT Corporation de Argentina S.A. IDT Dutch Holdings B.V. IDT Financial Services Limited (Gibraltar) IDT France S.A.R.L. IDT Germany GmbH IDT Global Limited (U.K.) IDT Hellas Telecoms E.P.E. IDT Italia S.R.L. IDT Netherlands B.V. IDT Spain IDT Telecom Asia Pacific Limited IDT Telecom Canada Corp. IDT Telecom South Africa (PTY) LTD Interdirect Tel Limited (IE) MJP C.V Prepaid Cards B.V.B.A. Zedge Limited (UK)