How can I identify contacts created through ScanContacts for HubSpot?

Check using the “Original source drill-down 2” property.

To filter these contacts out:

1. In your HubSpot account, go to Contacts > More filters.
2. Search “Original source drill-down 2”.
3. Select “contains exactly” and add the option “209312” (ScanContacts App ID).
4. Then click “Apply filter”.