Every Microsoft 365 organisation has a unique identifier called a Tenant ID (a GUID like
72f988bf-86f1-41af-91ab-2d7cd011db47)
and one or more domain names (e.g. contoso.com).
This tool lets you resolve either one to the other — useful for identifying an unknown organisation,
verifying a partner tenant, or bulk-enriching a list of domains.
Enter a domain name or a Tenant GUID below, one per line, or upload a file. Results can be exported as CSV.
Enter one identifier per line — tenant GUID or domain name.
Upload a .txt, .csv or .xlsx file. First column, one identifier per row. Max 300 identifiers.