Multiple Networks
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Blackbird
Check usernames and email addresses on websites and social networks
Free
Have I Been Pwned?
Does an email or a phone number appear in data breaches?
Free
holehe
holehe allows you to check if the mail is used on different sites like twitter, instagram and will retrieve information on sites with the forgotten password function.
Free
Intelx.io
Find user details in data breaches
Partially Free
Namechk
A username and domain search tool that checks on which platforms or domain a given username is registered.
Free
Open Measures
Open Measures helps open source researchers investigate harmful online activity such as extremism and disinformation.
Partially Free
Sherlock
Check usernames across more than 400 websites and social networks.
Free
Skopenow
Social Media Investigations - name, phone, email, username searches
Paid
Social-searcher
Search hashtags and usernames across various platforms.
Partially Free
WhatsMyName
Search for usernames on several hundred platforms
Free