The World's Largest Repository of historical DNS data

Data for security companies, researchers and teams who need to drill down, find suspicious changes to DNS records, check IP history, and prevent future fraudulent or criminal activity.

Largest Archive of Past and Present DNS History

Search by IP, Hostname, Domain, Keyword—get A, AAAA, MX, NS records and more.

11 Years’ Worth of Historical DNS Data and Counting

Partial access to a database of roughly 3.4 trillion historical DNS lookups as far back as mid-2008.

Powerful API Puts 3.4 Trillion Records at Your Fingertips

The most current DNS and domain intel enriching your datasets, any way you like it, with our powerful API.

The Data You Want, The API You Need

Cyber Forensics

Find suspicious changes to DNS records using our domain history and see how incidents correlate. Use our historical DNS lookup, perform a DNS search and check the domain IP history for forensic analysis.

Access to 1 billion+ passive DNS datasets

Elsewhere, other DNS archives use passive DNS to watch real queries coming through your ISP. DNS Trails forces DNS record lookup everyday, synthetically checking everything everyday.

11 years of DNS history & a powerful API

Fully-indexed historic and current DNS record history, WHOIS data and WHOIS changes, daily-updated domain history database, and passive DNS datasets easily integrated with our API.

Get the most out of our API

Passive DNS
Instant IP & Domain search
Hostname Information

DNS Record History
Domain Historical WHOIS Data
Domain Names
Website Technologies

Get Started for Free

Service Disruption

API, SurfaceBrowser
Feb 4th, 04:22 PM

Test status - UPDATED

“ Identifying the issue ”
impact: none | status: identified
API, Feeds
Feb 4th, 04:19 PM

Api and Feeds pages effected

“ Investigating the issue with the Api ”
impact: minor | status: investigating
Corporate Website
Jan 27th, 12:01 PM

Main site minor issue

“ Site test issue that was identified and in the process of resolution. Our staff is working to mitigate the issue. ”
impact: minor | status: identified