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# Updating Aether's callsign prefix database

Aether includes a built in callsign prefix database, which is used for automatically determining country, DXCC entity, ITU zone and CQ zone when a callsign is entered. This database can be updated to keep up with changes in prefix assignments and the DXCC list. To update Aether's prefix database, follow the steps below. It is also possible to make your own changes to Aether's prefix database. To see information on the file format used by Aether, see this page.

To update Aether's callsign prefix database:

1. Download an up to date prefix file from the Country Files website at: http://www.country-files.com/cty/cty.csv (direct download link).
2. Copy the file to the folder /Library/Application Support/Aether or /Users/yourusername/Library/Application Support/Aether (where 'yourusername' is the username of your user account on your Mac).
3. Ensure that the file is named "cty.csv".
4. Restart Aether to reload the prefix database file.

## See also

Editing Aether's callsign prefix database
Looking up the QRZ.com listing for a contact
Automatically determine country
Automatically determine DXCC code
Automatically determine ITU Zone
Automatically determine CQ Zone
Callbook Lookup Topics
Aether Preferences Topics