While there have been efforts to create a centralized database of ISO 9001 certified companies… these efforts have largely gone unrealized. HOWEVER, some Certification Bodies (CBs) have an online database for customers to “verify” the certification status of their clients. For example:
Citation IRQAO Certificate Validation
Intertek (Business Assurance) Certificate Validation
UKAS CertCheck (for UKAS accredited certifications ONLY)
IAF is attempting to create an International Database allowing companies to validate certificates from multiple CBs & countries. At the time of this writing, the service was free. Sign-up for a free account from: https://www.iafcertsearch.org/validate-certificates