UpgradeMSP Tools
Microsoft 365 Tools

Domain Checker

Check if a domain is connected to a Microsoft 365 tenant

About this tool

The Domain Checker tool helps you quickly verify if a domain is connected to a Microsoft 365 tenant. This can be useful for:

  • Administrators setting up new tenants
  • Consultants verifying domain availability
  • IT professionals troubleshooting domain issues

Note: For demonstration purposes, this tool simulates API responses. Domains like microsoft.com, outlook.com, github.com, and domains ending with .onmicrosoft.com will show as connected.