# Fast check of ip address list
**URL:** https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388
**Category:** Elasticsearch
**Created:** [November 19, 2018, 3:49pm UTC](https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388 "2018-11-19T15:49:53Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@elk2](https://discuss.elastic.co/u/elk2)
#### Post date: [November 19, 2018, 3:49pm UTC](https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388/1 "2018-11-19T15:49:53Z")
I have a many logs from external ip address that connect to my web application.
I would like to check this ip address into logs with my list in a text file.
How can I check if there is ip address into logs that are also into my list?
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### Author:  [@elk2](https://discuss.elastic.co/u/elk2)
#### Post date: [November 21, 2018, 8:54am UTC](https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388/2 "2018-11-21T08:54:53Z")
This is a good solution! Thanks Christian.
But for logs that are already indexed?
> [@Christian\_Dahlqvist](#):
>
> One option would be to look up the IP and add a tag or field during indexing, e.g. using a Logstash translate filter.
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### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [November 21, 2018, 8:58am UTC](https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388/3 "2018-11-21T08:58:21Z")
One option would be to look up the IP and add a tag or field during indexing, e.g. using a Logstash translate filter.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 19, 2018, 8:58am UTC](https://discuss.elastic.co/t/fast-check-of-ip-address-list/157388/4 "2018-12-19T08:58:34Z")
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