If you are a software developer, you can download the entire Club Log exceptions and prefix lookup data. This is encouraged as one of the driving reasons for Club Log's existence is to increasing logging accuracy, You are very welcome to use Club Log to take the chore out of this problem. There is no fee or licensing
This is the recommended method for getting the DXCC of DX Cluster or Skimmer spots.
Downloading the Club Log definitions
The address to download the XML file is: https://cdn.clublog.org/cty.php?api=APIKEY (updated daily).
The file format is XML. When you download this file, you need to supply your API key. This can be obtained by emailing the helpdesk and providing further details of your proposed use.
XSD Schema for cty.xml
You can download the XSD schema here: https://cdn.clublog.org/cty.xsd.
Downloading as ZIP instead of GZIP
The file is supplied in a GZIP archive, but if you need ZIP you can add zip=1 to the URL:
https://cdn.clublog.org/cty.php?api=APIKEY&zip=1
Last change times
If you wish to check before downloading the latest XML file, you can do this by calling:
https://clublog.org/cty_last_change.php
This will return the last update time where a change was made, in the form YYYY-MM-DD HH:MM:SS (expressed in UTC).
Additional notes
Legacy requests (such as made to https://secure.clublog.org or other old addresses) are no longer supported as of 2021-11-12. Only requests made to https://cdn.clublog.org are permitted. This is to conserve bandwidth because each download of the file is typically 500kb or more. The legacy URLs have not been used for over 5 years as of this date.
The Club Log XML file is free but it would be appreciated if you could help promote Club Log if you incorporate this data into your logging program.