Requirements for your provider

To put a Drupal-site (6.x) on the web, you need a web hosting account (provider) with two features that are essential to building a Drupal site:

• MySQL Database. Version 4.1 or higher is highly recommended.
• PHP. Version 5.2 or higher is recommended, although PHP version 4.3.5 should work with Drupal version 5 or 6.

More detail on Drupal.org