> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fly.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Connect From a Fly App

<Warning>
  **This page is archived.** Fly Postgres (unmanaged) is no longer maintained, and Fly.io Support is not able to provide support or guidance for it. We now offer [Fly.io Managed Postgres](/postgres), our fully-managed database service that handles all aspects of running production PostgreSQL databases.

  These pages are kept for reference and are not listed in the navigation. The full set is indexed on the [Fly Postgres (Unmanaged)](/unmanaged-postgres) page.
</Warning>

Connection string URIs are a common way to describe a connection to a Postgres server. The output from `flyctl postgres create` provides a connection string of the format:

```
postgres://{username}:{password}@{hostname}:{port}/{database}?options
```

Fly Postgres is an app that belongs to your Fly organization. The `hostname` in this string resolves to an internal IPv6 address that can be reached by any of your apps that live in the same [IPv6 private network](/networking/private-networking).

You can give this connection string to another Fly app by passing it as a secret, or by [Attaching](/unmanaged-postgres/managing/attach-detach) it.