Whois-based lookup is a common way for Domain Validation (DV). Certificate Authorities (CA), like DigiCert, use this data to validate domains for issuing certificates. However, it has become unreliable and CA/Browser Forum decided to use more strict DV methods.
Starting from 8 January 2025, DigiCert will stop manual HTTPS web-based Whois lookup to obtain domain contact information for domain validation. And Whois lookup will be no longer supported as a DV method on 8 May 2025.
Customers are recommended to use other methods for DV during application process of SSL Certificate.
