WhoisXML API Introduces Domain Info API — A Modern Way to Access WHOIS Data

WhoisXML API announces the launch of the Domain Info API, a new cyber intelligence solution designed to deliver a single, enriched WHOIS record for any active or expired domain name by leveraging WhoisXML API’s massive historical WHOIS database. The Domain Info API automatically fills in WHOIS fields that are redacted or missing for any domain name, using the latest available historical data.

Domain expirations and privacy regulations have made it difficult to obtain easy-to-digest, contextualized WHOIS records. Standard WHOIS lookups return no results for expired domains and frequently display redacted information for active domains. This leaves a significant data gap for security researchers, cyber investigators, security operations centers (SOCs), and security solutions providers.

The Domain Info API is designed to help close this gap using WhoisXML API’s comprehensive historical WHOIS database, which has been maintained since 2010 and contains over 25.5 billion WHOIS records across more than 774 million domains and 7,596+ TLDs and ccTLDs.

For every domain that users search, the Domain Info API will automatically:

• Return a WHOIS record: Unlike a regular WHOIS lookup, the Domain Info API will always return a record, even if the domain has expired or been deleted.
• Enrich the data: It intelligently fills in redacted or missing fields using the most recent publicly available, non-redacted information from WhoisXML API’s historical WHOIS database.
• Provide a single output: Instead of sifting through multiple historical WHOIS records, the Domain Info API consolidates all the latest available information into a single, enriched WHOIS record.

The Domain Info API makes data easier to process and integrate into existing security workflows, transforming a limited snapshot of domain ownership data into a more contextualized record.

As Jonathan Zhang, CEO at WhoisXML API, explains: “The Domain Info API ensures that users always receive an enriched record, even for expired domains, by combining the most relevant information from our historical data into a single, clear output. This restores critical context that's often missing in modern cyber investigations and helps us get one step closer to our mission of a more transparent Internet.”

It’s important to note that for domains redacted since their day of registration (e.g., domains registered post-GDPR), no public data ever existed for some of the fields, and the Domain Info API cannot recover information that was never publicly available.

The Domain Info API is also accessible through the web-based Domain Research Suite as Domain Info Search.

To learn more about the Domain Info API, visit the product page or check out the documentation.