Exhibit 21 Subsidiaries of Oncologix Tech, Inc. Subsidiaries of Registrant Percent of Ownership State of Incorporation of BestNet Subsidiary or Jurisdiction Communications Corp. ---------- --------------- -------------------- Oncologix Corporation Nevada 100% International Environment Delaware 100% Corporation Interpretel (Canada) Inc. Province of Ontario 100% Interpretel, Inc. Arizona 100% Telplex International Arizona 100%