# Subdomain

Configure your default statusdashboard.io subdomain.

Source: https://statusdashboard.com/docs/status-dashboards/domains/subdomain

The platform subdomain is your dashboard's default address on `statusdashboard.io`. Change it from the Domains tab when you need a different slug; the update takes effect immediately.

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## Format requirements
When you create a dashboard, StatusDashboard assigns it a unique subdomain on `statusdashboard.io` (e.g., `acme.statusdashboard.io`). This subdomain:

* Can be changed at any time from the **Domains** tab — the change takes effect immediately.
* Is always active and requires no DNS configuration.
* Redirects visitors to your custom domain automatically once a [custom domain](/docs/status-dashboards/domains/custom-domain) becomes active.

> If you change the subdomain, your dashboard URL changes immediately. Any bookmarks, links, or embedded widgets using the old subdomain will stop working. If you use the embeddable widget, copy the updated embed code from the **Widget** tab and replace it on your site.

| Requirement        | Details                                                                                               |
| ------------------ | ----------------------------------------------------------------------------------------------------- |
| **Characters**     | Lowercase letters (`a–z`), digits (`0–9`), and hyphens (`-`) only. Uppercase letters are not allowed. |
| **Start and end**  | Must begin and end with a letter or digit — leading or trailing hyphens are not allowed.              |
| **Maximum length** | 63 characters.                                                                                        |

**Valid examples:** `acme`, `acme-corp`, `acme123`

**Invalid examples:** `Acme` (uppercase), `-acme` (leading hyphen), `acme-` (trailing hyphen)