SecurityTrails
DomainTools
WhoisXML API
openSquat
SentryScore
DomainOps
DomScan
IP Ninja
WhoisAPI
WebCargo
WhoisThisDomain
Whoisology
JsonWhois.io
Bulk Whois API
Active Whois Browser
WhoAPI
WhoisAPI is recommended for developers, cybersecurity professionals, digital marketers, and businesses that require domain information for security analysis, market research, and integration into their own systems or applications.
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Based on our record, SecurityTrails seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I'm having the same issue. https://securitytrails.com/ also had my "secret" staging subdomain. I made a catch-all certificate, so the subdomain didn't show up in CT logs. It's still a secret to me how my subdomain ended up in their database. - Source: Hacker News / over 1 year ago
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.
WebCargo - Optimize your workflow by offloading it to us. Useful API's with seamless integration that scale to your needs.
WhoisXML API - Domain, IP, and DNS data provider
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
openSquat - The openSquat is a service for detecting domain look-alikes by searching for newly registered domains that might be impersonating legit domains and brands.
Whoisology - Connected database of whois records and whois history