---
title: Registered domain processor
description: Extracts the registered domain (also known as the effective top-level domain or eTLD), sub-domain, and top-level domain from a fully qualified domain...
url: https://www.elastic.co/elastic/docs-builder/docs/2659/reference/enrich-processor/registered-domain-processor
products:
  - Elasticsearch
---

# Registered domain processor
Extracts the registered domain (also known as the effective top-level domain or eTLD), sub-domain, and top-level domain from a fully qualified domain name (FQDN). Uses the registered domains defined in the [Mozilla Public Suffix List](https://publicsuffix.org/).


| Name             | Required | Default          | Description                                                                                                                                                                                                                    |
|------------------|----------|------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `field`          | yes      |                  | Field containing the source FQDN.                                                                                                                                                                                              |
| `target_field`   | no       | `<empty string>` | Object field containingextracted domain components. If an `<empty string>`, the processor addscomponents to the document’s root.                                                                                               |
| `ignore_missing` | no       | `true`           | If `true` and any required fieldsare missing, the processor quietly exits without modifying the document.                                                                                                                      |
| `description`    | no       | -                | Description of the processor. Useful for describing the purpose of the processor or its configuration.                                                                                                                         |
| `if`             | no       | -                | Conditionally execute the processor. See [Conditionally run a processor](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/manage-data/ingest/transform-enrich/ingest-pipelines#conditionally-run-processor). |
| `ignore_failure` | no       | `false`          | Ignore failures for the processor. See [Handling pipeline failures](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).       |
| `on_failure`     | no       | -                | Handle failures for the processor. See [Handling pipeline failures](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/manage-data/ingest/transform-enrich/ingest-pipelines#handling-pipeline-failures).       |
| `tag`            | no       | -                | Identifier for the processor. Useful for debugging and metrics.                                                                                                                                                                |


## Examples

The following example illustrates the use of the registered domain processor:
```json

{
  "pipeline": {
    "processors": [
      {
        "registered_domain": {
          "field": "fqdn",
          "target_field": "url"
        }
      }
    ]
  },
  "docs": [
    {
      "_source": {
        "fqdn": "www.example.ac.uk"
      }
    }
  ]
}
```

Which produces the following result:
```json
{
  "docs": [
    {
      "doc": {
        ...
        "_source": {
          "fqdn": "www.example.ac.uk",
          "url": {
            "subdomain": "www",
            "registered_domain": "example.ac.uk",
            "top_level_domain": "ac.uk",
            "domain": "www.example.ac.uk"
          }
        }
      }
    }
  ]
}
```