Keeping ClusterMaster updated

When ITU changes a prefix allocation, or ARRL adds a country to the DXCC list or deletes a country, it is appropriate to replace the ClusterMaster files containing information on prefix and country allocations with an updated version.

First check, in your ClusterMaster directory, the date of files PREFIXES.TBL (ITU prefixes) and DXCC.TBL (DXCC countries). Then compare the dates against those of current version.

Such files include the new South Sudan (ST0) DXCC country.

Notice will here be given when updated files will become available. At that time you shall just:


Check this page from time to time, to learn of any change.

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