Hostinger AI Builder: How to connect a subdomain in agentic mode

Connect a subdomain to your Hostinger AI Builder agentic mode web application to make it accessible online. Your web application publishes on a temporary domain initially when you create it, and you can later replace the temporary domain with a custom domain (for example domain.tld) or a subdomain (for example app.domain.tld).

Before you start

The subdomain must be from a domain you own.
Only first-level subdomains are supported (for example, app.domain.tld).
Second-level subdomains (for example, shop.app.domain.tld) are not supported.

This guide explains how to connect a custom subdomain to a Hostinger AI Builder application using a temporary domain. To switch to a different custom domain or subdomain, refer to the domain change guide.

Step 1 – Create a Hostinger AI Builder web application on a subdomain

If you have not yet created the website, start from adding it to your hosting plan:

Open hPanel and go to Websites.
Select Add website on the desired hosting plan.
Choose Hostinger AI Builder, then choose Agentic
Complete the onboarding process.
In the Hostinger AI Builder platform, click Publish.
On the pop-up, click on Connect to a custom domain
Enter the subdomain name and continue.

This connects the subdomain to the website. Now you can proceed to the next step to point the domain.

Connect the subdomain later

If you prefer to connect the subdomain at a later time, or if you have already created the website, follow these steps:

Go to hPanel → Websites
Locate the website using a temporary domain, and click on Connect domain below the temporary domain name to continue with domain connection.

If the website was not published before connecting the subdomain, make sure to publish it before moving to the next step.

Step 2 – Point the subdomain

For the website to be accessible using the subdomain, the subdomain’s DNS must point to Hostinger.

If the domain uses Hostinger nameservers

If the main domain is pointing to Hostinger nameservers, no additional action is required.
The subdomain connects automatically and becomes available shortly.

If the domain uses external nameservers

If the domain’s DNS zone is managed outside Hostinger (for example, at Cloudflare):

Go to hPanel → Websites
Locate the website using a temporary domain, and click on Check guide below the custom subdomain name, and continue with the instructions provided.

NOTES

A Hostinger AI Builder website can be connected only to one address (domain or subdomain) at a time.
Subdomains from domains registered under a different Hostinger account cannot be connected.