1 EXHIBIT 21.1 SUBSIDIARIES OF HADCO CORPORATION DIRECT SUBSIDIARIES (100%) OWNED BY HADCO CORPORATION) STATE OR COUNTRY/ TERRITORY OF ORGANIZATION Hadco Santa Clara, Inc. (f/k/a Zycon Corporation) Delaware Hadco Phoenix, Inc. (f/k/a Continental Circuits Corp.) Delaware Zycon Corporation (a name holding corporation) Delaware Continental Circuits Corp. (a name holding corporation) Delaware Hadco Foreign Sales Corporation U.S. Virgin Islands Hadco Ireland Limited Ireland Hadco Scotland Limited Scotland INDIRECT SUBSIDIARIES STATE OR COUNTRY/ TERRITORY OF ORGANIZATION CCIR of California Corp. (100% owned by Hadco Phoenix, California Inc.) CCIR of Texas Corp. (100% owned by Hadco Texas Phoenix, Inc.) Hadco Corporation (Malaysia) SDN.BHD. (f/k/a Zycon Malaysia Corporation, SDN.BHD) (100% owned by Hadco Santa Clara, Inc. Continental Circuits International, Inc. (100% owned by Barbados Hadco Phoenix, Inc. 21