|Ordered||25 Aug 1941|
|Laid down||25 Nov 1942||Deutsche Werft AG, Hamburg (werk 386)|
|Launched||23 Jun 1943|
|Commissioned||6 Oct 1943||Kptlt. Harald Bosüner|
|Successes||1 ship damaged, total tonnage 7,134 GRT|
1 warship a total loss, total tonnage 1,370 tons
Taken out of service on 14 April 1945 and scuttled on 5 May, 1945 west of Wesermünde, in position 53.32N, 08.35E.
Men lost from U-boats
Unlike many other U-boats, which during their service lost men due to accidents and various other causes, U-1223 did not suffer any casualties (we know of) until the time of her loss.