.de is the country code top-level domain (ccTLD) for the Federal Republic of Germany.
DENIC (the Network Information Centre responsible for .de domains) does not require specific second-level domains,
as it is the case with the .uk domain range which require .co.uk domain for example.
The name is based on the first two letters of the German name for Germany (Deutschland). Prior to 1989,
East Germany had a separate ISO 3166-1 code (dd), and had a never delegated ccTLD, .dd.
.de is currently the most popular ccTLD in terms of number of registrations with .uk being the second most popular ccTLD and .nl being third.
It is second after .com among all TLDs.
The first point of registration for .de domains was at the Department of Computer Science of the University of Dortmund.
uni-dortmund.de was among the first registered .de-domains.
--info found at Wikipedia.