# Logstash reverse field DNS name **URL:** \ **Category:** Logstash\ **Created:** [April 4, 2017, 11:10am UTC](https://discuss.elastic.co/t/logstash-reverse-field-dns-name/81123 "2017-04-04T11:10:16Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Kim-Kruse-Hansen](https://avatars.discourse-cdn.com/v4/letter/k/f1d935/32.png) [@Kim-Kruse-Hansen](https://discuss.elastic.co/u/Kim-Kruse-Hansen)\ **Post date:** [April 4, 2017, 11:10am UTC](https://discuss.elastic.co/t/logstash-reverse-field-dns-name/81123/1 "2017-04-04T11:10:16Z")
Hi Suppose I have fields with fully qualified DNS names. fx [myhost.company.com](http://myhost.company.com) fx [myhost.company.biz](http://myhost.company.biz) We have millions of these names. Suppose I want to search for all DNS names ending in \*.biz. This leads me to inefficient wildcard search or ? So I was thinking if I should create a new field where the name is reversed to make searching more efficient. com.company.myhost. biz.company.myhost. But I dont know if this is the correct approach. And how would I reverse a field in logstash ? Any thoughts ? Regards Kim ---
**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\ **Post date:** [April 4, 2017, 2:38pm UTC](https://discuss.elastic.co/t/logstash-reverse-field-dns-name/81123/2 "2017-04-04T14:38:59Z")
Use a [path hierarchy tokenizer](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-pathhierarchy-tokenizer.html) for your field. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 2, 2017, 2:38pm UTC](https://discuss.elastic.co/t/logstash-reverse-field-dns-name/81123/3 "2017-05-02T14:38:59Z")
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