English
| U-421 | Type VIIC |
| Feldpost Number | M 49 743 |
| Construction Yard | Danziger Werft AG, Danzig |
| Yard Number | 122 |
| Ordered | 10th Apr 1941 |
| Keel laid | 20th Jan 1942 |
| Launched | 24th Sep 1942 |
| Commissioned | 13th Jan 1943 |
| Baubelehrung | 7.KLA, Danzig |
| Training, Flotillas and Duties | |
| 01.43 – 10.43 | 8.U-Flottille, Danzig Ausbildungsboot (under training) |
| 11.43 – 03.44 | 9.U-Flottille, Brest Frontboot (operational) |
| 04.44 – 04.44 | 7.U-Flottille, St.Nazaire Frontboot (operational) |
| Commanders | |
| 13.01.43 – 29.04.44 | LT ~ OL Hans Kolbus see also: U-596 U-407 |
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