DNSDB is a database that stores and indexes both the passive DNS data available via Farsight Security’s Security Information Exchange as well as the authoritative DNS data that various zone operators make available.

DNSDB makes it easy to search for individual DNS RRsets and provides additional metadata for search results such as first seen and last seen timestamps as well as the DNS bailiwick associated with an RRset. DNSDB also has the ability to perform inverse or rdata searches.

The original DNSDB provides our Standard Search capabilities and is accessed with DNSDB API Version 1.DNSDB 2.0 is an evolution of DNSDB Standard search capabilities and is accessed with DNSDB API Version 2.

DNSDB Flexible Search is an extension to DNSDB 2.0 that add ways to flexibly search DNSDB by regular expressions and globs (aka wildcarding). It is accessed with the Flex API extensions to the DNSDB APIv2.

These pages describe the data available from DNSDB and how to make bulk, automated DNSDB Standard Search and Flexible Search queries via the RESTful APIs.


DNSDB is a Passive DNS (pDNS) historical database that provides a unique, fact-based, multifaceted view of the configuration of the global Internet infrastructure DNSDB leverages the richness of Farsight’s Security Information Exchange (SIE) data-sharing platform and is engineered and operated by leading DNS experts. To learn more about DNSDB, please see https://www.farsightsecurity.com/solutions/dnsdb/.

DNSDB API Version 1 and Version 2

Flexible Search support is part of DNSDB 2.0 and adds both Regular Expressions and Globbing syntaxes for more granular and accurate search results. To learn more about Flexible Search, please see Introducing DNSDB 2.0.

DNSDB Export

DNSDB Export is an on premises version of the DNSDB API server, allowing customers who need maximum performance and privacy to host their own instance of DNSDB so that none of their data or activity is visible on the wider internet.


DNSDB Scout is a web-based GUI for the DNSDB API available for both Google Chrome and Firefox browsers. To learn more about DNSDB Scout, please see DNSDB Scout.