When using? "QRZ.com via Pathfinder", which requires only a free QRZ account, lookups are rate-limited to one every 4 seconds. For DXers, this limit is only relevant when importing an ADIF or tab-delimited file with the "Import QSOs" tab's "Query callbook…" option enabled. The fact that Pathfinder downloads and displays QRZ's advertising does make lookups slower than using QRZ's "XML Data" service, which requires a paid subscription.

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You can specify a secondary callbook to use when the primary callbook is inaccessible or doesn't have an entry for the requested callsign.

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See

https://www.dxlabsuite.com/dxkeeper/Help/Configuration.htm#Callbook%20Tab

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Step-by-step instructions are here:

https://www.dxlabsuite.com/dxlabwiki/CallbookLookup

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