What is ?FORM=ZZNR

I see this?FORM=ZZNR at the end of reported URLs

[Erku]

I was looking at my webmaster central area and Google is reporting plenty of ?FORM=ZZNR at the end.

Have you seen them? What are those ?FORM=ZZNR

We use Drupal.

[ogletree]

It is specific to Drupal from what I can tell. There are a lot of pages out there that use it. When you remove it the pages does not change. This is something that drupal is putting on your pages and is creating duplicate content. I would recommend using the canonical tag.

[Erku]

We do use canonical tags now I am wondering if our rankings will go up. We just started to use cannonical tags a week ago, but we have more and more pages being indexed daily. Is there a way to check if there is a possible penalty?

[ogletree]

That would not cause a penalty by itself.

[Erku]

I am wondering if there is an online tool where you would put the URL and it will show if there is penalty or no. And if there is what may cause it?