securitytrails.com
API to search current and historical DNS records, current and historical WHOIS, technologies used by sites and whois search for phone, email, address,
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vx-underground.org
Malware research archive with papers, samples, writeups, and historical security material.
osint.sh
OSINT.sh tool for checking historical DNS records and domain infrastructure changes.
securitytrails.com
Attack-surface and DNS intelligence platform for domains, subdomains, IPs, and historical records.
thetrumparchive.com
Archive for searching Donald Trump's historical Twitter posts by date, topic, or keyword.
vx-underground.org
Historical malware archive mirrored by vx-underground for research and preservation.
osint.sh
OSINT.sh tool for checking historical WHOIS records and domain ownership changes.