The table shows the number of aircraft recorded against each specific registrar. Normally registrars are per-country but in some cases more than one country can be managed by a single registrar. For example - Switzerland and Liechtenstein share a registrar and a single registration mark "HB-".
Registrars highlighted in green are actively updated by AvDelphi on a continuing basis as data is supplied by the registrar. Others rely on periodic basis.
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