Wikipedia
Cylex.de is a German online business directory with about 4.5 million entries. The site exists since 1999 and is operated by the Cylex, based in Palota, Romania. Contrary to other providers from the outset entries are not chargeable.
The concept of using keywords in individual entries was introduced in the Cylex business directory in 1999 and in the course of time it also has established at other business information services for delivering accurate search results.
Besides addresses Cylex.de also includes German city maps and location plans for the companies. The latter can be used by registered companies for their own websites.
On Alexa.com the ratio of the daily range can be compared to those of other business information services on the Internet.