Custom Domain Name

Scalingo provides a subdomain of for all applications to access your application. Of course, you may want to use your own domain name. This operation requires different configuration operations:

Buy a domain name

We do not sell domain names. You can buy one from a company which sells them (called registrar) such as:

  • DNS Simple -
  • OVH -
  • Gandi -

You can find an exhaustive list of registrars on the ICANN website. The process is pretty similar with any of these services. You search for the availability of the domain and if it is available, you can buy it per year.

Configure your application

Let’s say you bought the domain name You first need to configure your Scalingo application to accept requests to this domain. You can achieve this with our CLI, or through our dashboard.

Using our CLI

scalingo --app my-app domains-add <domain name>

Using the web dashboard

Go to the ‘Domains’ tab of your app dashboard, fill the ‘Domain Name’ text field and validate by clicking on ‘Link domain name to the app’.

Configure your domain name

After having bought a domain name you need to configure it. Most of the registrars provide a web dashboard to do so. To target your application hosted on Scalingo, you need to create a CNAME field targeting the fully qualified domain name (FQDN)


The raw configuration line to create an alias between and is:

www    10800    IN    CNAME
This operation is not instantaneous. DNS propagation can take up to days to be completely done.

After this configuration is completed, a Let’s Encrypt certificate is automatically generated for your application.

Root domain

Most of the registrars only allow A field for root domains. However A should target an IP. As Scalingo don’t ensure that our front IP addresses won’t change over time, we advise you to use a subdomain for your application or to migrate your domain name to another DNS provider.

Some providers allow to create ALIAS, ANAME or CNAME field for root domains:

  • DNSimple (ALIAS)
  • DNS Made Easy (ANAME)
  • easyDNS (ANAME)
  • CloudFlare (CNAME)
  • PointDNS (ALIAS)

If you want to keep your registrar which is not compatible with root domain aliases, you can create a A field targeting our web entry point This IP may change in the future, in this case you’ll get an email at least 30 days in advance to let you know you have to change your domain configuration.

Wildcard domain

App configuration

You may want to redirect all subdomains of your domain to a specific Scalingo application. To achieve this you’ve to add a domain name with the form:

  • *
  • *

Then all requests targeting for instance or will be redirected to this specific application.

Note that Let's Encrypt wildcard certificates are not globally available. If you add such a custom domain, we will not be able to create the Let's Encrypt certificate.


If an application has the wildcard domain * configured and that another application is using, the wildcard will not override the admin subdomain. Actually, any complete subdomain will have priority over the wildcard.

DNS configuration

If you need to redirect all the subdomains to Scalingo servers, you need to setup your DNS accordingly, it’s really close to configuring a single domain name:

*      10800    IN    CNAME
This operation is not instantaneous. DNS propagation can take up to days to be completely done.


When you add an alias, we don’t do any prior verification. If you cannot add your alias because it’s already taken on Scalingo and you think you’re legit to use it, send an email to describing the problem.

schedule 02 Jan 2017