Why Is My IP Blocked by Prolific?

Your IP address is rejected by Prolific (often showing error codes like PEC-SUB-0002) because their strict participant screening systems flag your connection as a non-residential proxy or VPN. Research platforms like Prolific block all commercial hosting ASNs to prevent automated bots or out-of-region users from compromising scientific study data. If your IP is shared with hundreds of VPN users, has a high abuse history, or if its ISP registration country does not perfectly match your physical residence and account profile, your access is instantly blocked. To participate in studies, you must connect from a clean, domestic residential broadband IP. Below, IPOK provides a comprehensive multi-source IP analysis, checking your ISP status, datacenter classification, and threat score across major databases to help you identify and resolve the specific network factors triggering Prolific's PEC blocks.

Prolific's data reliability relies on valid IP matching. Check your network metrics using the IPOK multi-source tool below.