# Primary vs. Secondary DNS

**URL:** <https://discourse.pi-hole.net/t/primary-vs-secondary-dns/1536>\
**Category:** Help\
**Created:** [January 30, 2017, 3:18pm UTC](https://discourse.pi-hole.net/t/primary-vs-secondary-dns/1536 "2017-01-30T15:18:58Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![DL6ER](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/dl6er/32/281_2.png) [@DL6ER](https://discourse.pi-hole.net/u/DL6ER)\
**Post date:** [January 30, 2017, 3:36pm UTC](https://discourse.pi-hole.net/t/primary-vs-secondary-dns/1536/4 "2017-01-30T15:36:57Z")

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> [@apexalpha](#):
>
> It seems the only way to find out if it uses both servers at the same time, like the Pi, is to wait and see if ads appear.

You can also specifically blacklist some domain and try to access it several times a day from different client devices.

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