Default app domain name and DNS targets updated for Fir-generation apps

Change effective on 12 March 2025

Heroku has implemented improvements to DNS management for the Fir-generation, and all new Fir apps utilize sharded DNS zones which will have the new domain format of the following: <haiku>.<regional-haiku>.herokuapp.com. For example:example-app-1234567890ab.redwood-oregon.herokuapp.com

Similarily, Fir Private Spaces apps now use <haiku>.<regional-haiku>.herokudns.com for DNS targets.

While your app is available at your default domain, we strongly recommend adding a custom domain to production apps. You can view your updated DNS targets with the heroku domains command. See View existing domains for details.