---
title: Rollback
description: Roll back a subdomain zone setup.
image: https://developers.cloudflare.com/core-services-preview.png
---

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# Rollback

Refer to the following process to understand how you can rollback a [subdomain setup](https://developers.cloudflare.com/dns/zone-setups/subdomain-setup/) and recreate the corresponding subdomain DNS records in an existing parent zone within Cloudflare.

## Before you begin

* This guide assumes both your child domain (`blog.example.com`) and its parent domain (`example.com`) are in Cloudflare.
* In the child zone, review and [export](https://developers.cloudflare.com/dns/manage-dns-records/how-to/import-and-export/#export-records) the DNS records.

Important

This process may incur in downtime, as it is not possible to add address records (A/AAAA) while still having [corresponding NS records at the same name](https://developers.cloudflare.com/dns/manage-dns-records/troubleshooting/existing-ns-record/) within the parent zone.

## Steps

1. (Optional) In the parent zone, migrate over any settings - [WAF custom rules](https://developers.cloudflare.com/waf/custom-rules/), [Rules](https://developers.cloudflare.com/rules/), [Workers](https://developers.cloudflare.com/workers/), and more - that might be needed for the child domain.
2. (Optional) If necessary, [order an advanced SSL certificate](https://developers.cloudflare.com/ssl/edge-certificates/advanced-certificate-manager/) that covers the child domain and any deeper subdomains.
3. In the parent zone, go to the [**DNS Records** ↗](https://dash.cloudflare.com/?to=/:account/:zone/dns/records) page.
4. Delete one of the `NS` records defined for the child domain.
5. Edit the remaining `NS` record to create the subdomain address record.
6. [Import](https://developers.cloudflare.com/dns/manage-dns-records/how-to/import-and-export/#import-records) the records you had obtained [before you began](#before-you-begin).

```json
{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/directory/","name":"Directory"}},{"@type":"ListItem","position":2,"item":{"@id":"/dns/","name":"DNS"}},{"@type":"ListItem","position":3,"item":{"@id":"/dns/zone-setups/","name":"DNS setups"}},{"@type":"ListItem","position":4,"item":{"@id":"/dns/zone-setups/subdomain-setup/","name":"Subdomain setup"}},{"@type":"ListItem","position":5,"item":{"@id":"/dns/zone-setups/subdomain-setup/rollback/","name":"Rollback"}}]}
```