Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > PowerScale OneFS User Mapping: Mapping Identities Across Authentication Providers > Appendix: Viewing mappings with the Platform API
The OneFS Platform API lets you view and modify your user mappings rules programmatically. You can also view the mappings for a user by identifying the user by username, UID, GID, or SID.
To connect to the OneFS Platform API, use a REST client, such as RESTClient, which you can add on to Mozilla Firefox for free, with the following settings for your HTTP requests:
You can view your user mapping rules in JSON with the following GET request:
https://192.0.2.2:8080/platform/1/auth/mapping/users/rules
You can also view the mapping for a user by specifying the user in the request. The following request displays the mapping for the root account in the system zone:
https://192.0.2.2:8080/platform/1/auth/mapping/users/lookup?user=root&zo ne=system
With a lookup request, you can append the following parameters to filter your queries: user, zone, uid, gid, sid, and primary_gid. Here is an example:
https://192.0.2.2:8080/platform/1/auth/mapping/users/lookup?uid=10000