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Russian Callsign database - Russians Ham on-line lookup database. Search and create new callsign records. The most full russian and CIS callsign database (more 50,000 CIS records). More than 1,400,000 international calls.

ITU Callsign Prefixes - Ham Radio ITU International Callsign Country Prefixes

International SWL-Registry - Easily obtain a free and unique International SWL Callsign and, if you wish, be added to the Worldwide Online SWL Directory. Official certificates are also available.