Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name of Subsidiary Jurisdiction ------------------ ------------ 1. IFX/Communications Ventures, Inc. State of Delaware 2. FX Chicago, Inc. State of Delaware (a) IMSI, Inc. State of Illinois 3. IFX/Telecom, Inc. State of Delaware (a) Telcom.Net, L.P. State of Delaware 4. IFX/EN, Inc. State of Delaware (a) Emerging Networks, Inc. British Virgin Islands (i) IFX Online, Inc. State of Delaware (ii) IFX/ENI-SPC I, Inc. British Virgin Islands (A) Internacional Conection Service 1500, C.A Venezuela (iii) IFX/ENI-SPC II, Inc. British Virgin Islands (A) ENI Costa Rica SRL Costa Rica (iv) IFX/ENI-SPC III, Inc. British Virgin Islands (A) ENI Colombia Limitada Columbia (v) IFX/ENI-SPC IV, Inc. British Virgin Islands (A) Servicios de Internet ENI Chile, Limitada Chile (B) Interaccess, S.A. Chile (vi) IFX/ENI-SPC V, Inc. British Virgin Islands (A) ENI de Argentina SRL Argentina (vii) IFX/ENI-SPC VI, Inc. British Virgin Islands (A) ENI de Honduras SRL Honduras (viii) IFX/ENI-SPC VII, Inc. British Virgin Islands (A) ENI de Nicaragua SRL Nicaragua (ix) IFX/ENI-SPC VIII, Inc. British Virgin Islands (A) Zupernet Limitada Bolivia (x) IFX/ENI-SPC IX, Inc. British Virgin Islands (xi) IFX/ENI-SPC X, Inc. British Virgin Islands (xii) ENI Mexican Holdings, Inc. State of Delaware (A) Interweb de Mexico, S.A. de C.V. Mexico (xiii) IFX/ENI-SPC Ecuador, Inc. British Virgin Islands (xiv) IFX/ENI-SPC El Salvador, Inc. British Virgin Islands (xv) IFX/ENI-SPC Guatemala, Inc. British Virgin Islands (xvi) IFX/ENI-SPC Nicaragua, Inc. British Virgin Islands (xvii) IFX/ENI-SPC Honduras, Inc. British Virgin Islands (xviii)IFX/ENI-SPC Panama, Inc. British Virgin Islands (xix) IFX/ENI-SPC Uruguay, Inc. British Virgin Islands (xx) Minority Stock Holding Corp. British Virgin Islands (xxi) ENI Brazilian Holdings, Inc. State of Delaware (xxii) CELC/IFX, LLC State of Delaware (A) Communications Equipment Leasing Corp. British Virgin Islands