Hi Dominic,

Thank you for your answer.

Unfortunately using "attribute=value" doesn't seem to work either.

When searching using the following urls I get the whole list of operating systems in my Foreman installation (see results attached)

https://<foreman_server>/api/v2/operatingsystems?name=CentOS
 https://<foreman_server>/api/v2/operatingsystems?fullname=CentOS 6.3

Another way to search for objects that I'm using successfully when looking for hosts is to use their name in the url like this:

https://<foreman_server>/api/v2/hosts/<name_of_the_server>

So I thought to give it a try and do the same and test:

https://<foreman_server>/api/v2/operatingsystems/CentOS 6.3

But it seems to be a problem with the parsing because the call aboive throws back:

{

"error": {
        "message": "Resource operatingsystem not found by id 'CentOS 6'" 
    }

}

Oh sorry, I copied your example without reading and checking it. It looks like we don't have a field at the moment for the "fullname", since that area (the concatenated name) is a bit complex and messy. It may be better to search for a specific name, major and minor. Anyway, glad that helped a bit, closing.