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OSINT.sh tool for checking historical WHOIS records and domain ownership changes.

Verisign WHOIS lookup for checking domain registration records and registry information.

Easy whois is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

Mark Monitor WHOIS is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

is a web service for Whois data contained within ARIN's registration database

WhoIsHostingThis is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

WhoisMind is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

Whoisology is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

WHOIS intelligence service for searching domain ownership, history, and registrar data.

API to search current and historical DNS records, current and historical WHOIS, technologies used by sites and whois search for phone, email, address,

is an IP address and domain name based researching websites that offers multiple services such as Reverse DNS Lookup, Whois, and AS Macros.

Who.is is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.

Domain intelligence tool for researching WHOIS data, ownership patterns, and connected domains.

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.

Retrieve DNS records, subdomains, SSL certificates and WHOIS / RDAP data for a given website.

CentralOps collection of DNS, WHOIS, traceroute, email, and network lookup tools.

The site allows you to look up domain registration information (WHOIS) on the internet

Is a free platform offering network diagnostic tools (ping, traceroute, MTR, DNS, WHOIS, HTTP, etc.) tailored for ISPs and infrastructure professional

Online service for detailed and free analysis of suspicious files and URLs.

Privacy Guides comparison page for choosing VPN providers and understanding VPN tradeoffs.

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

Hash lookup service for checking password hashes against large precomputed cracking databases.

Threat intelligence search service for checking IPs, domains, hashes, and security indicators.