Exhibit 21

The ADT Corporation (a Delaware corporation)

Significant Subsidiaries

Country		Entity		State
Canada		ADT Security Services Canada, Inc.
Gibraltar		Tyco International (Gibraltar) III Limited
Puerto Rico		ADT Puerto Rico, LLC
United States		ADT Canada Holdings, Inc.			DE
United States		ADT Holdings, Inc.			DE
United States		ADT Investments, Inc.			DE
United States		ADT LLC			DE
United States		ADT US Holdings, Inc.			DE
United States		Electro Signal Lab, Inc.			DE
United States		S2 Mergersub Inc.			NJ