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, and prevent future fraudulent or criminal activity.

Want more out of our API? Get full access.

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 IP history for forensic analysis.


Access to 1 billion+ passive DNS datasets

Elsewhere, other 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 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
  • Tagging
  • DNS Record History
  • Domain Historical WHOIS Data
  • Domain Names
  • Website Technologies