given organization ID, what is organization short name then?

[hoogw]

These mix of letter and number long string is arcgis online organization ID.

These ID does not tell you who is owner, if you can find the organization short name behind these ID, then you know the owner.  These red part are organization short name.

This is structure of Arcgis REST api endpoint. 

https://services1.arcgis.com/[Organization ID]/arcgis/rest/services/[Feature Service Name]/FeatureSe...

As you can see, organization ID placed right after arcgis.com.

ESRI must have database to link the org id with org name.  The question is how we as public user can access this information?

Has ESRI give public access to this information ?

[WilliamCooper]

I think ESRI does not provide a public database linking organization IDs to organization names. However, you can determine the owner by checking the organization short name in the URL, as shown in the red-highlighted parts. Some organizations also publicly have their details in ArcGIS Hub or Open Data portals. If ESRI has an API or tool for this lookup then it is likely restricted to authorized users. You may need to contact direct ESRI support for more information.

[hoogw · Accepted solution]

If you know organization ID, 

you know organization short name by get portal json meta data,  urlKey field is organization short name

in portal json "self", it also reveal organization name, title, admin contact email, etc... everything. 

Even org self hosted enterprise portal URL in this portal self json file. 

Summary, if you know org-id, then you know everything about this organization. 

Including self hosted enterprise portal, self hosted arcgis server,   Of course esri hosted arcgis online, and esri hosted arcgis feature server.