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Columbus Project is an advanced subdomain discovery service with fast, powerful and easy to use API.

Abuseipdb helps search threat intelligence, IP reputation, domains, and security investigation data.

AnalyzeID is a unified search tool for finding web pages, files, records, code, or internet intelligence.

Free and open-source domain and infrastructure research toolkit combining DNS, RDAP, WHOIS, passive subdomain discovery, IP and ASN data, email authen

Free DNS, WHOIS, DKIM discovery, SPF/DMARC analysis and blacklist checks with plain-English results, no signup.

Research paper and dataset about internet-wide scanning and host discovery from 2012.

Islegitsite helps search threat intelligence, IP reputation, domains, and security investigation data.

Security lookup platform for scanning files, hashes, URLs, IPs, and domains against threat data.

IoT search and discovery platform for finding connected devices and sensor data sources.