DNS Trails

The World's Largest Repository of historical DNS data.

This is in beta, and limited at this time.
This site contains partial access to a database of roughly 2 trillion DNS records, that have been collected daily since mid-2008 (to keep the site manageable, only one day is available per month of data, so you will only see a total of about 100 days of data shown per domain (one day per month for the past 8+ years), rather than the 3,100 or so collected).
I am working on finding a home for the daily historical forward DNS. Contact dns [at] rscott (dot) org for more information.

Domain Lookups:


Date is optional (use '201301201' format, which would be December 1, 2013)

Searches through our proprietary historical DNS database for DNS data on a domain (checking one date each month, the rest of the data is archived). How big is the full database? Huge. 40+ TB compressed.

The data accessible here goes back to mid-2008. It covers all .com, .net, .org, .biz, .info, .mobi, and .name domains.

IP Lookups:


Date is optional (use '201301201' format, which would be December 1, 2013). With a date, IP can use CIDR (e.g.

Looks up an IP address, showing what domains refer to it (website, mail server, DNS server).

Partial Domain Search:

Partial Domain:
Lets you search domains for a string. For example, 'google' will show all domains with 'google' in them.

See domains that are hosted near your IP.

See the IP heat map that shows where servers are among the 4B IPv4 IPs.

Drill down IP ranges, seeing how many hosts are in each IP range, who the IPs are delegated to, and the reverse DNS.

Historical Reverse DNS: go to PTRarchive.com.

If you need to contact someone regarding DNS queries from dnstrails.com,
or are looking for bulk DNS queries (e.g. for a search engine),
please E-mail dns [at] rscott.org
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