Use a phone number lookup service
Search social media platforms by name, username, or email
Check professional networking sites
Use public records databases
Search online directories
Look through mutual contacts and friends
Check alumni or workplace directories
Use search engines with full name, city, or employer
Review public posts, comments, or tagged photos
Contact known associates or family members
Use reverse image search if you have a photo
Hire a licensed private investigator
Contact local authorities if the person is missing or at risk