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Hacked / Breached Account Research Sites & Links
(This page was last updated on the 05/03/2026)
There are a number of really useful online resources, both Free and Paid For, where you can research an individual, an address, a company or a domain name, to see if there are any linked email addresses, mobile numbers and usernames etc, which have been part of any hacked account details, and then been released or leaked online. These generally aren't from when an individual's account has been hacked but rather often relate to large scale hacking events or cyber-attacks, where a company or online site has been hacked, and millions of account holders details illegally obtained and then sold or leaked online.
Often these account holders details are sold on, and misused by criminals, but they are also captured and put on Breached Data Sites, where you can easily search for details. Many of these sites are advertised and run with the intention that you can see if your own details have been part of these large data breaches, so you can take steps to make yourself more secure and change leaked passwords etc. However these sites are also a great place for an OSINT Researcher to locate information on subject.
So you may have a subject who you are researching, but no linked email address or mobile number for them, then you could use these sites to search their name or address, looking for any linked email addresses or mobile numbers. As well as linked email addresses or mobiles, the results may provide other useful leads and additional information into a subject, as well indications of which online sites they were linked to when hacked, and so where they may still have an online account etc.
Or you may have an email address or mobile number that you are researching but do not know who they are linked to, then you could use these sites to search details of anyone linked to the email address or mobile number. Or if someone regularly uses the same account name or screenname for any online accounts or emails addresses, then you could use these sites to search details of any account name or screenname, to see if they are linked to any email addresses, or account details.
Or, without breaking any laws, so say you are in law enforcement and need to know someone's passwords, as you may need to gain entry to a device, then you could use these sites to search details of your subject, their email address or mobile number, to locate any passwords. Or, some people use the same password on multiple accounts, then you could use these sites to search a password, to see if it is linked to any other accounts.
Hacked / Breached Accounts Searching Sites
Hacked / Breached Accounts Linked Sites
Customer Service Details (if your online account has been taken over)
