# Identity & People Intelligence > Trace individuals through usernames, emails, phone numbers, addresses, and relationship networks. - **URL:** https://hackindex.io/platforms/osint/identity-and-people-intelligence - **Platform:** [OSINT](https://hackindex.io/platforms/osint.md) - **Published:** 2026-04-11 - **Updated:** 2026-04-11 Identity intelligence maps people to their digital footprint across the internet. Email discovery through search engines, data breaches, and OSINT tools reveals accounts, organizational roles, and communication patterns. Username correlation links identities across platforms by matching handles, naming patterns, and profile details. Social media profiling reveals personal information, work history, and relationships that feed social engineering. Breach data lookups expose reused passwords and security questions that may still be valid on target systems. ## Guides - [Email Intelligence](https://hackindex.io/platforms/osint/identity-and-people-intelligence/email-intelligence.md): Techniques for harvesting and analysing email addresses to map identities, infer infrastructure, validate accounts, and uncover organisational relationships via OSINT methods. - [Email Address Discovery and Harvesting](https://hackindex.io/platforms/osint/identity-and-people-intelligence/email-intelligence/email-discovery.md): Techniques for discovering and harvesting email addresses from public sources to map organisational attack surfaces and identify exposed personnel. - [Email-to-Identity Resolution](https://hackindex.io/platforms/osint/identity-and-people-intelligence/email-intelligence/email-identity-resolution.md): Maps email addresses to real identities using breach data, social platforms, username enumeration, and metadata analysis to build comprehensive target profiles. - [Email Infrastructure Analysis](https://hackindex.io/platforms/osint/identity-and-people-intelligence/email-intelligence/email-infrastructure-analysis.md): Analyze email infrastructure using DNS records, MX configurations, SPF/DKIM/DMARC policies, and mail server fingerprinting to map organizational email systems. - [Email Verification and Validation](https://hackindex.io/platforms/osint/identity-and-people-intelligence/email-intelligence/email-verification.md): Techniques for verifying email address validity, ownership, and breach exposure using OSINT tools, DNS analysis, and passive reconnaissance methods. - [Historical Identity and Change Detection](https://hackindex.io/platforms/osint/identity-and-people-intelligence/historical-identity.md): Tracks changes in online identities over time using OSINT techniques to detect alias shifts, profile updates, and behavioural pattern evolution across platforms. - [Account Deletion and Reactivation Detection](https://hackindex.io/platforms/osint/identity-and-people-intelligence/historical-identity/account-deletion-detection.md): Tracks account deletion and reactivation patterns across platforms to identify suspicious identity cycling, evasion tactics, and coordinated inauthentic behaviour. - [Archived Profile Recovery](https://hackindex.io/platforms/osint/identity-and-people-intelligence/historical-identity/archived-profile-recovery.md): Recover deleted or outdated online profiles using cached pages, archival tools, and OSINT techniques to reconstruct digital identities and historical online presence. - [Username and Name Change History](https://hackindex.io/platforms/osint/identity-and-people-intelligence/historical-identity/username-and-name-change-history.md): Tracks username and name changes across platforms to uncover aliases, historical identities, and linked accounts for subject attribution. - [Phone Number Intelligence](https://hackindex.io/platforms/osint/identity-and-people-intelligence/phone-number-intelligence.md) - [Phone Number Lookup and Carrier Identification](https://hackindex.io/platforms/osint/identity-and-people-intelligence/phone-number-intelligence/carrier-lookup.md) - [Messaging Platform Enumeration from Phone Numbers](https://hackindex.io/platforms/osint/identity-and-people-intelligence/phone-number-intelligence/messaging-platform-enumeration.md) - [Reverse Phone Search Techniques](https://hackindex.io/platforms/osint/identity-and-people-intelligence/phone-number-intelligence/reverse-phone-search.md) - [Physical Address and Location Tracing](https://hackindex.io/platforms/osint/identity-and-people-intelligence/physical-address-tracing.md) - [Address Lookup via Public Records](https://hackindex.io/platforms/osint/identity-and-people-intelligence/physical-address-tracing/address-lookup.md) - [Address-to-Identity Correlation](https://hackindex.io/platforms/osint/identity-and-people-intelligence/physical-address-tracing/address-to-identity.md) - [Property Ownership and Land Registry Research](https://hackindex.io/platforms/osint/identity-and-people-intelligence/physical-address-tracing/property-ownership.md) - [Real Name Resolution](https://hackindex.io/platforms/osint/identity-and-people-intelligence/real-name-resolution.md) - [Name-to-Account Mapping Techniques](https://hackindex.io/platforms/osint/identity-and-people-intelligence/real-name-resolution/name-to-account-mapping.md) - [Reverse Name Search Across Platforms](https://hackindex.io/platforms/osint/identity-and-people-intelligence/real-name-resolution/professional-and-social-search.md) - [Voter, Court, and Public Record Lookups](https://hackindex.io/platforms/osint/identity-and-people-intelligence/real-name-resolution/public-record-lookups.md) - [Relationship and Network Mapping](https://hackindex.io/platforms/osint/identity-and-people-intelligence/relationship-and-network-mapping.md) - [Associate and Employer Mapping](https://hackindex.io/platforms/osint/identity-and-people-intelligence/relationship-and-network-mapping/associate-and-employer-mapping.md) - [Family and Relationship Discovery](https://hackindex.io/platforms/osint/identity-and-people-intelligence/relationship-and-network-mapping/family-and-relationship-discovery.md) - [Building a Subject Link Graph](https://hackindex.io/platforms/osint/identity-and-people-intelligence/relationship-and-network-mapping/link-graph-building.md) - [Username Enumeration & Cross-Platform Correlation](https://hackindex.io/platforms/osint/identity-and-people-intelligence/username-enumeration.md) - [Cross-Platform Correlation and Account Linking](https://hackindex.io/platforms/osint/identity-and-people-intelligence/username-enumeration/cross-platform-correlation.md) - [Username Enumeration with Sherlock](https://hackindex.io/platforms/osint/identity-and-people-intelligence/username-enumeration/sherlock.md): Discover how to use Sherlock to hunt usernames across 300+ platforms, mapping digital footprints and exposing linked accounts during OSINT reconnaissance. - [Username Variation Generation](https://hackindex.io/platforms/osint/identity-and-people-intelligence/username-enumeration/variation-generation.md)