Kosmos 400 was placed into a low Earth orbit with a perigee of 990 kilometres (620 mi), an apogee of 995 kilometres (618 mi), 65.8 degrees of inclination, and an orbital period of 105 minutes. It was successfully intercepted and destroyed by Kosmos 404 on 4 April. As of 2009, debris is still in orbit.
Kosmos 400 was the third of the five original DS-P1-M satellites to be launched, of which all but the first were successful. Following the five initial launches the DS-P1-M satellite was replaced with a derivative, Lira.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in brackets.