German Directory Assistance / Inlandsauskunft
Operator Assisted Enquiry Services

11880 Directory Assistance by Telegate for numbers in Germany / Inlandsauskunft
11833 Directory Assistance by Deutsche Telekom for numbers in Germany / Inlandsauskunft

118xx are the equivalent
to the North American 411 or the Indian 197 / 183

It is impossible to call German Directory Assistance from abroad.
This if the central number
of the operator Deutsche Telekom
+49 228 1810