# Filter specific IP-Addresses
**URL:** https://discuss.elastic.co/t/filter-specific-ip-addresses/132689
**Category:** Logstash
**Created:** [May 21, 2018, 5:57pm UTC](https://discuss.elastic.co/t/filter-specific-ip-addresses/132689 "2018-05-21T17:57:13Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@nin77](https://discuss.elastic.co/u/nin77)
#### Post date: [May 21, 2018, 5:57pm UTC](https://discuss.elastic.co/t/filter-specific-ip-addresses/132689/1 "2018-05-21T17:57:13Z")
Hey!
I got a Web-Interface where the User can add several IP-Addresses which are interested for him, the rest of the lines without that IP-Address should be removed from the log-file. I looked into grok and cidr filter but I am not sure if that is possible with them? Any ideas how to do that?
Thanks!
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [May 21, 2018, 7:25pm UTC](https://discuss.elastic.co/t/filter-specific-ip-addresses/132689/2 "2018-05-21T19:25:03Z")
Please explain the use case in greater detail. Are you starting Logstash based on actions taken in a web interface? Reading one input file and writing the filtered log entries to another file?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 18, 2018, 7:25pm UTC](https://discuss.elastic.co/t/filter-specific-ip-addresses/132689/3 "2018-06-18T19:25:06Z")
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