With nothing but an IP address it’s possible to purchase data append services that reveal a user’s email address, physical address and more. Large sites sell lo

With nothing but an IP address it’s possible to purchase data append services that reveal a user’s email address, physical address and more. Large sites sell login data to data brokers, keying user account info to IPs. Marketers upload lists of IPs and get back an enriched list with a full profile. Obviously it can get fuzzy with multiple people under the same IP. But in many cases it’s all that is needed for identification.