# Bro Blog: Using Bro to Build a Passive DNS Database

**URL:** <https://community.zeek.org/t/bro-blog-using-bro-to-build-a-passive-dns-database/3351>\
**Category:** Zeek\
**Created:** [November 7, 2014, 4:42pm UTC](https://community.zeek.org/t/bro-blog-using-bro-to-build-a-passive-dns-database/3351 "2014-11-07T16:42:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Dopheide\_Jeannette\_M](https://avatars.discourse-cdn.com/v4/letter/d/2bfe46/32.png) [@Dopheide\_Jeannette\_M](https://community.zeek.org/u/Dopheide_Jeannette_M)\
**Post date:** [November 7, 2014, 4:42pm UTC](https://community.zeek.org/t/bro-blog-using-bro-to-build-a-passive-dns-database/3351/1 "2014-11-07T16:42:59Z")

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[http://blog.bro.org/2014/11/using-bro-to-build-passive-dns-database.html](http://blog.bro.org/2014/11/using-bro-to-build-passive-dns-database.html)

Searching DNS logs became a lot faster with the launch of our Passive DNS tool for Bro. It uses Bro’s DNS logs to build a database that is more compact, and therefore a lot easier to search.

See how we did it by checking it out on GitHub:

[https://github.com/JustinAzoff/bro-pdns](https://github.com/JustinAzoff/bro-pdns)

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**Author:** ![system](https://canada1.discourse-cdn.com/flex011/uploads/zeek/original/1X/f09d732bc2cc7c7cc7e35db67cf4e1d5233ce7a7.png) [@system](https://community.zeek.org/u/system)\
**Post date:** [May 6, 2022, 3:42pm UTC](https://community.zeek.org/t/bro-blog-using-bro-to-build-a-passive-dns-database/3351/2 "2022-05-06T15:42:13Z")

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Closed on May 6, 2022, 3:42pm UTC