Badonion_collection_may2017_to_april2020.zip

Lists of "email:password" pairs used by threat actors for Credential Stuffing attacks (trying the same password on multiple sites like Netflix, Amazon, or banking portals).

If your data is in this collection, it likely means a service you used between 2017 and 2020 was compromised. BadOnion_Collection_May2017_to_April2020.zip

This is a "combo list" or "leak aggregator." It typically contains raw data scraped from hidden services (Tor network), including credentials (usernames/emails and passwords), database dumps, and forum posts. Lists of "email:password" pairs used by threat actors

Use services like Have I Been Pwned to see if your email address was part of major leaks during this era. Use services like Have I Been Pwned to

The filename refers to a known large-scale archival collection of data scraped from various Dark Web "onion" sites and forums between 2017 and 2020.

Are you looking to verify if a was included in this archive for security auditing purposes?

As the name suggests, it covers a three-year period (May 2017 – April 2020), capturing data from sites that may have since been seized by law enforcement or gone offline.