WhoisXML API offer a vast selection of domain/IP/DNS data feeds, APIs, research and monitoring web tools and cyber threat intelligence. Their coverage includes 15.6+ billion historical WHOIS records across 7298+ TLDs and ccTLDs, 4.2+ billion domains and subdomains, 12.9+ million IP netblocks, 99.5% of IPs in use, and 20.7+ billion historic DNS lookups gathered from over a decade of data aggregation.
"WHOIS API is easy to use and provides the required results, which helped us understand the infrastructure criminals abuse to host malicious domains and conduct smishing. The implementation using the API documentation is straightforward."




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