Subdomain

As explained in Building Web APIs with ASP.NET Core

A subdomain is a subordinate domain name created within a parent domain's namespace.

A subdomain is a subordinate domain name created within a parent domain’s namespace. It provides a readable web address that can resolve to an Internet Protocol address. section 12.1.2

For deployment, a parent domain such as mybglist.com can host a dedicated endpoint such as win-01.mybglist.com. The name can be created through DNS and associated with a virtual machine’s public IP address. section 12.1.2 section 12.2.3

Configure a custom subdomain by:

• Registering or selecting the parent domain. section 12.1.2
• Retrieving the Azure virtual machine’s public IP address. section 12.2.3
• Adding a Cloudflare A record with Name win-01, the VM’s IPv4 address, Proxied status, and automatic TTL. section 12.2.3

Deployment endpoint

The A record creates win-01.mybglist.com and points it to the Windows VM’s public IP address. An Azure-managed alternative, mybglist-win-01.westeurope.cloudapp.azure.com, resolves directly to the VM. section 12.2.3

Figure 12.12 Cloudflare Add Record settings for win-01.mybglist.com

Use the DNS management settings to inspect the A record fields for win-01.mybglist.com. section 12.2.3

How Building Web APIs with ASP.NET Core covers it

How deep it goes

Explains naming and A-record configuration, but stops short of broader DNS and TCP/IP fundamentals.

Examples

Uses win-01.mybglist.com and mybglist-win-01.westeurope.cloudapp.azure.com as deployment addresses.

What it assumes

Assumes basic networking and TCP/IP knowledge while defining domain names through deployment examples.

What you can do after

Operate/configure a custom Cloudflare subdomain that points to an Azure VM’s public IP address.

How it connects

Connects DNS names with parent domains, A records, public IP addresses, virtual machines, and CDNs.

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Also explained in

• 

  liveBookmanning.com
  Architecture Modernization: Socio-technical alignment of software, strategy, and structureA business subdomain is a distinct subdivision of a broader business domain with its own related knowledge, activities, and bounded scope.
• 

  liveBookmanning.com
  Acing the CCNA Exam: Volume 2 Advanced Networking and SecurityA subdomain is a domain located beneath another domain in the DNS hierarchy.

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Related concepts

• supporting subdomainincludes · A supporting subdomain is a business domain that enables core capabilities, typically requires organization-specific customization, and provides limited competitive differentiation.
• core subdomainincludes · A core subdomain is a strategically important business area whose distinctive, complex logic provides organizational differentiation or competitive advantage.
• generic subdomainincludes · A generic subdomain is a standardized business capability containing logic common across organizations and offering little opportunity for organization-specific differentiation.
• core domain chartused by · A core domain chart is a domain-driven design technique for classifying domains by their strategic importance and distinguishing core domains from supporting and generic domains.
• componentpart of · A software component is a modular part of a larger system that provides related functionality and interacts with other parts through defined boundaries or interfaces.

This explainer was generated by Manning's knowledge graph from the text of Building Web APIs with ASP.NET Core. The section links point to the parts of the book it draws on.