Kari, OH2XX has collected for CCF members an updated MASTER.DTA master callsign database. It is for CT contest software but it can be used in some other softwares as well. There is two files available: master.zip is zipped abt 500k file (40000 calls, which appeared at three times in database) and bigmast.zip abt 700k file (57000 calls, which appeared at least twice in database). Tnx Kari !

Download master.zip
Download bigmast.zip