Showing attributes in AD with powershell

hi, I want to list one of the attributes in my AD with powershell code

the problem is, this attribute seems an attribute that created by my company, and I dont know how to list it, since if it were a common attribute, such as DN, we can simply do it like:

$a = get-qadobject -anr blablabla

echo $a.DN

but this attribute called my_company.department_ID

is there any way to list it?

any help will be appreciated