Hi Petrusja,
Idflieg serials: There was a seperate number range for each category and within each category a new series for each year thus
D.1234/17 was a Siemens Schuckert D.1b
D.1234/18 was a LFG Roland D.VIa
C.1234/17 was a Albatros C.XII (OAW)
C.1234/18 was a Halberstadt CL.II
There was an incomplete list, that was not updated for sometime on the net. I'll see if I can find it on wayback and post the link if I can find it. Update it is available at :
http://airplane.designation-systems.net/
Just a few words though it was a laudable attempt by Roger on the subject but further information has emerged since and many more serials are know known and there are also a few questionable entries. Still I believe it may serve as a good starting point.
Regards,
Clint