Azure DNS

Azure DNS is a hosting service for domains and provides naming resolution using the Microsoft Azure infrastructure.
By hosting your domains in Azure, you can manage your DNS records using the same credentials, APIs, tools, and billing as your other Azure services.

Public DNS vs Private DNS

Public DNS: A public DNS maintains a record of publicly available domain names reachable from any device with internet access.
Private DNS resides behind a company firewall and maintains records of internal sites. Employees of the company use the private DNS to access internal sites and services without having to remember IP addresses.

DNS domains in Azure DNS are hosted on Azure's global network of DNS name servers, providing resiliency and high availability.
Azure DNS uses anycast networking, so each DNS query is answered by the closest available DNS server to provide fast performance and high availability for your domain.

Azure DNS is based on Azure Resource Manager, which provides features such as:

Azure role-based access control (Azure RBAC) to control who has access to specific actions for your organization.
Activity logs to monitor how a user in your organization modified a resource or to find an error when troubleshooting.
Resource locking to lock a subscription, resource group, or resource. Locking prevents other users in your organization from accidentally deleting or modifying critical resources.

Azure DNS can manage DNS records for your Azure services and provide DNS for your external resources as well.
You can manage your domains and records with the Azure portal, Azure PowerShell cmdlets, and the cross-platform Azure CLI.
Applications that require automated DNS management can integrate with the service by using the REST API and SDKs.

Azure DNS also supports private DNS domains.
This feature allows you to use your own custom domain names in your private virtual networks, rather than being stuck with the Azure-provided names.

Azure DNS also supports alias record sets.
You can use an alias record set to refer to an Azure resource, such as an Azure public IP address, an Azure Traffic Manager profile, or an Azure Content Delivery Network (CDN) endpoint.
The alias record set points to the service instance, and the service instance is associated with an IP address.
If the IP address of the underlying resource changes, the alias record set seamlessly updates itself during DNS resolution.