When downloading HQ combo lists, there are several factors to consider to ensure that you're getting the best data for your marketing needs:

: Attackers feed these lists into tools like OpenBullet or Sentry MBA to perform credential stuffing , which tests stolen logins across hundreds of different sites per minute to find matches where users have reused passwords.

Ensure the format matches your tools (e.g., user:pass vs email:pass ).

A combo list is a curated database of credentials. The "HQ" or "High Quality" designation typically implies that the list has several specific characteristics: