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• Whois — Basic Whois lookup
• ICANN Whois — Official ICANN Whois
• ARIN — North America IP registry
• RIPE — Europe, Russia, Middle East IP registry
• APNIC — Asia-Pacific IP registry
• LACNIC — Latin America and Caribbean IP registry
• AFRINIC — Africa IP registry
• Apnic WhoWas — Historical Asia-Pacific domains
• SIDN — Netherlands domain registry
• Eurid — .EU domain registry

• DomainTools — Domain research platform
• DomainIQ — Domain intelligence and history
• Completedns — DNS history database
• IPQS - Toolbox for domain/IP intelligence
• WhoisRequest — Domain ownership history lookup
• SecurityTrails — DNS and infrastructure data
• Robtex — Infrastructure graph explorer
• Web-Check - Website analysis tool

• crt.sh — Certificate Transparency logs
• PassiveDNS (Mnemonic) — Historical DNS resolution
• DNSDumpster — DNS mapping and reconnaissance
• DNSlytics — DNS, IP, and ASN intelligence
• ViewDNS — Multi-tool for DNS and Whois lookups

• BuiltWith — Website technology profiler
• Wappalyzer — Detect CMS, frameworks, and technologies
• Netcraft — Site reports and hosting analysis
• Online Nikto scanner — Identifying Potential Vulnerabilities and Misconfigurations (Active & OSINT)
• SpyOnWeb — Shared analytics and advertising IDs
• VisualSiteMapper — Website relation mapping

• IPVoid — IP lookup and blacklist checks
• IP Location — Approximate IP geolocation
• Maxmind — Geo IP tool
• CentralOps — Network lookup toolkit
• Network-Tools — Classic network OSINT (legacy)
• Online Port scanner — Check Open Ports (Active Scanning & OSINT) for Target Host
• I Know What You Download — Torrent history by IP

• CarbonDate — Estimate when a domain was created
• Whois EasyCounter — Historical Whois and ownership details
• WhyNoHTTPS — Database of sites without HTTPS
• URL Dater - Nifty tool to check age of website

• SimilarSites — Find websites similar to a given domain
• SitesLike — Discover alternative sites and competitors