Security health from a distance
See through the external internet surface area of any company from a single unified web interface.
API and Data Services for Top Security Companies
Try the free search to get a taste of our data reserves
SecurityTrails API
APIs for Security Companies, Researchers and Teams
Tap into a treasure-trove of cyber security gold and get the info you can’t find anywhere else. We’re proud to offer security analysts and developers the most current DNS and domain intel with our powerful API.
3.4 Trillion
Historical DNS lookups
3 Billion
Historical WHOIS records
909 Million
Total hostnames tracked
323 Million
Total Domains tracked
"We spent a ton of time and effort building out our own domain lists, but we gave up when we found SecurityTrails – the data was better than anything else we've seen, and allowed us to focus on our core product."
Ben Dowling
IPinfo.io
"SecurityTrails solves the headache of accurately mapping a company's footprint with data you can't find anywhere else. If you are a security analyst or developer, you will get tremendous value from the most current domain intel through their API."
Bill Ladd
RecordedFuture
"SecurityTrails is my source of truth when it comes to threat hunting and research. The speed of the API is crazy and the integrations with automation tools and SIEM tools makes it an easy choice."
Mickey Perre
Splunk
SecurityTrails Feeds
High-quality data feeds for data enrichment
We use a sophisticated process of parsing zone files for Generic Top Level Domains (gTLDs) and recreating country code Top Level Domains (ccTLDs). We make them available from simple CSV download files or APIs that you can integrate into your application.
Whitepaper: Identifying a Company's Online Footprint
Learn how our algorithms work to discover associated domains, IPs, and SSL.
Latest Posts
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![Cybersecurity Experts Interview Series Recap]( "Cybersecurity Experts Interview Series Recap")
Cybersecurity Experts Interview Series Recap
Today we are recapping our interview series we started back in February, and all the great people we've had the chance to talk to.
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![Attack Surface: Concept, Types, Tools and Attack Surface Reduction Strategies]( "Attack Surface: Concept, Types, Tools and Attack Surface Reduction Strategies")
Attack Surface: Concept, Types, Tools and Attack Surface Reduction Strategies
Today, we'll explore what an attack surface is, and share some valuable analysis tools along with tips to help you reduce the attack surface area of your company.
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![How Stack Overflow kick-started an entire business: Talking with Ben Dowling from IPinfo]( "How Stack Overflow kick-started an entire business: Talking with Ben Dowling from IPinfo")
How Stack Overflow kick-started an entire business: Talking with Ben Dowling from IPinfo
What if we told you that one person has managed to build an entire business based on a question he found on Stack Overflow? Today we talk to Ben Dowling, founder of IPinfo.
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![Top 20 and 200 most scanned ports in the cybersecurity industry]( "Top 20 and 200 most scanned ports in the cybersecurity industry")
Top 20 and 200 most scanned ports in the cybersecurity industry
Today we're going to extend your port scanning knowledge by sharing the top 20 and 200 most popular ports recognized in the infosec industry.
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![It's never been easier to make a great product: A chat with Johannes Gilger from Urlscan.io]( "It's never been easier to make a great product: A chat with Johannes Gilger from Urlscan.io")
It's never been easier to make a great product: A chat with Johannes Gilger from Urlscan.io
We sat down with Johannes Gilger, creator of urlscan.io, to discuss entrepreneurship, his engineering philosophy, on how many servers urlscan.io runs, and the secret behind his obsessive list-making.
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![Is SSL really a sign of security?]( "Is SSL really a sign of security?")
Is SSL really a sign of security?
No matter if your site is labeled 'secure' or bears the 'padlock' icon — you can still get hacked easily.
