# Is It possible to verify that the value of a field in elasticsearch is in a external blacklist?
**URL:** https://discuss.elastic.co/t/is-it-possible-to-verify-that-the-value-of-a-field-in-elasticsearch-is-in-a-external-blacklist/19076
**Category:** Elasticsearch
**Created:** [August 4, 2014, 4:25pm UTC](https://discuss.elastic.co/t/is-it-possible-to-verify-that-the-value-of-a-field-in-elasticsearch-is-in-a-external-blacklist/19076 "2014-08-04T16:25:56Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Fedele\_Mantuano](https://discuss.elastic.co/u/Fedele_Mantuano)
#### Post date: [August 4, 2014, 4:25pm UTC](https://discuss.elastic.co/t/is-it-possible-to-verify-that-the-value-of-a-field-in-elasticsearch-is-in-a-external-blacklist/19076/1 "2014-08-04T16:25:56Z")
Hi,
Is It possible to verify that the value of a field in elasticsearch is in a
external list?
I have a blacklist of ip addresses and I want to check if a field value is
in this blacklist.
Thanks a lot.
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---
### Author:  [@Fedele\_Mantuano](https://discuss.elastic.co/u/Fedele_Mantuano)
#### Post date: [August 8, 2014, 10:32pm UTC](https://discuss.elastic.co/t/is-it-possible-to-verify-that-the-value-of-a-field-in-elasticsearch-is-in-a-external-blacklist/19076/2 "2014-08-08T22:32:18Z")
I solved with this:
> **[Elasticsearch Platform — Find real-time answers at scale](https://www.elastic.co)**
>
> Power insights and outcomes with the Elasticsearch Platform and AI. See into your data and find answers that matter with enterprise solutions designed to help you build, observe, and protect. Try Elasticsearch free today.
On Monday, August 4, 2014 6:25:56 PM UTC+2, Fedele Mantuano wrote:
> Hi,
>
> Is It possible to verify that the value of a field in elasticsearch is in
> a external list?
>
> I have a blacklist of ip addresses and I want to check if a field value is
> in this blacklist.
>
> Thanks a lot.
--
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:09am UTC](https://discuss.elastic.co/t/is-it-possible-to-verify-that-the-value-of-a-field-in-elasticsearch-is-in-a-external-blacklist/19076/3 "2017-07-06T01:09:54Z")