The full reference for usernames, emails, phone numbers, device identifiers, and social/developer profile lookups — tool by tool, with inputs, outputs, and data source.
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This category is for following a person or account across the internet: the usernames they use, the email addresses and phone numbers tied to them, and the profiles they leave on public services. Almost every tool here reaches out to the network, because it checks a live, public service.
Tool
Input
Returns
Data source
Username Checker
A username
A parallel probe of 57 public platforms, showing where an account by that name exists
Live — contacts each platform
Username Generator
A person's real name, optional birthday and other details
Candidate usernames they plausibly use, for widening a search
Local
Holehe Check
An email address
Which well-known services have a registered account under that address
Live — probes each service
Tool
Input
Returns
Data source
Email Analyzer
An email address
The address parsed, plus its domain's MX/SPF/DMARC/DKIM records and any HIBP domain-breach entries
Network
Email Headers
Pasted message headers
What they say about where the message came from and how it traveled
Local
Email Permutator
A person's name and a domain
The email addresses that person plausibly has at that domain
Local
Harvester Emails
A domain
Email addresses for the domain harvested from DuckDuckGo HTML search results
Network
Password Breach
A password
Whether it appears in Have I Been Pwned's k-anonymous breach corpus, without sending the full password
Network
Tool
Input
Returns
Data source
Phone Lookup
A loosely formatted number, default-country hint
Parsed into E.164 form, with country, carrier, and line-type context
Mixed
IMEI Analyzer
A device IMEI
The device details it encodes, read apart offline
Local
Dedicated lookups for the services people use — each pulls a public profile in a consistent, readable form. All reach out to the platform's public API or JSON endpoint.
Tool
Input
Returns
GitHub User
A GitHub username
Profile, recent repositories, and recent gists
GitLab User
A GitLab username
The public account
Reddit User
A Reddit username
Profile and activity via Reddit's unauthenticated JSON API
Hacker News User
A Hacker News username
The public account
Mastodon User
A handle on any Mastodon/Fediverse instance
Profile, fields, and recent posts
Bluesky User
A Bluesky handle
Profile and recent posts
Wikipedia User
A Wikipedia username
What the account has done, and when
Keybase User
A Keybase username
The identity and what it has cryptographically proven