Investigator Use
Lookup ID (lookup-id.com) is a Facebook numeric user ID lookup tool that converts Facebook profile URLs or usernames into their underlying numeric Facebook ID, or vice versa — connecting a numeric ID to the associated Facebook profile URL.
For OSINT investigators, Facebook numeric ID lookup is a practical utility for API-level Facebook investigation. Facebook's Graph API uses numeric user IDs rather than usernames for programmatic queries — knowing a user's ID enables direct API access to their public profile data in structured format.
Facebook profile URL to ID conversion enables investigators to work with Facebook API endpoints that require numeric IDs, accessing structured profile data that may be more comprehensive than browser-based viewing.
Numeric ID to profile URL mapping allows investigators who have encountered Facebook numeric IDs in non-browser contexts (API responses, database records, log files) to identify the corresponding public profile.
Facebook pages, groups, and post IDs can also be resolved through similar lookup tools, enabling systematic API access to public page data for investigation.
The persistence of Facebook numeric IDs even when usernames change means that an ID discovered through early investigation remains valid even if the subject changes their Facebook username — a stable identifier for tracking accounts over time.
For investigations that involve programmatic Facebook data collection using the Graph API, having the correct numeric user ID is prerequisite for API queries on specific accounts.
Limitations: Lookup ID provides the identifier translation utility — it does not provide the actual profile data. The Facebook Graph API's access to public profile data depends on applicable Facebook platform policies and the specific data fields that have been made public by the account owner.
Document the profile URLs and numeric IDs identified for any Facebook accounts investigated, along with the query timestamps.
Before You Pivot
Record Context
Capture the target, search terms, and why this source is relevant before you leave the page.
Preserve Evidence
Archive volatile pages, save screenshots, and keep timestamps for anything that may change.
Corroborate
Treat one tool as a lead source. Confirm important findings with independent sources.
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