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

NERD IP reputation search for checking network entities, abuse data, and security signals.

Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.

Free, no-login IP reputation lookup that aggregates up to 8 risk sources, flags residential vs datacenter, and profiles /24 C-block neighbors. Also of

Open source URL shortener with custom domains, analytics, and self-hosting support.

Open source URL shortener with custom domains, analytics, and self-hosting support.

Search engine for exposed services, misconfigurations, leaked data, and internet-facing systems.

Maldives sex offender registry page for searching listed offenders and public records.

Threat intelligence search platform for malware indicators, IPs, domains, URLs, and hashes.

Manitoba public notification page for high-risk sex offender alerts and community safety information.

OSINT tool for collecting domain, IP, ASN, and infrastructure intelligence from multiple sources.

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

metagoofil

github.com

Metadata extraction tool for finding hidden information in public documents from target domains.

Michiganvoters.info helps search voter-registration records, voter databases, or public election-related data.

Browser extension for searching IPs, domains, hashes, URLs, and indicators across threat intelligence services.

Network diagnostic toolbox for DNS, MX, blacklist, SMTP, and domain health checks.

Internet asset search engine for domains, IPs, ports, certificates, and exposed services.

Steve Morse tool for searching New Jersey voter records and public registration information.

Steve Morse tool for searching New York voter records and public registration information.

Nigeria sex offender registry search for cases, names, and public offender records.

OSINT.sh online Nmap-style scanner for checking visible ports and network services.

Vehicle plate search site for finding Russian license plate photos and related car sightings.

UK number plate check for vehicle details, MOT history, tax status, and registration data.

Offshore Leak Database

offshoreleaks.icij.org

ICIJ database for searching offshore companies, people, addresses, and leaked financial records.