This page allows you to search your ADIF log for entities you have worked but have not yet received a QSL card from.
The script will process up to 200,000 QSOs. File type may be either ADI or ZIP, and the maximum file size accepted is 20MB. If your ADI file is larger than 20MB, you will need to upload it as a ZIP archive.
For this script to work correctly and display accurate results, each QSO in your ADIF log must contain valid <dxcc> and <qsl_rcvd> fields.