---
title: Rollback subdomain setup · Cloudflare DNS docs
description: Refer to the following process to understand how you can rollback a subdomain setup and recreate the corresponding subdomain DNS records in an existing parent zone within Cloudflare.
lastUpdated: 2025-01-14T14:12:46.000Z
source_url:
  html: https://patricia-pcx17119-l7-overrides.preview.developers.cloudflare.com/dns/zone-setups/subdomain-setup/rollback/index.md
  md: https://patricia-pcx17119-l7-overrides.preview.developers.cloudflare.com/dns/zone-setups/subdomain-setup/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 **DNS** > **Records**.
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).
