Finding my Original Domain?

So I've encountered an issue.

Simply, after I created my first forum (over a year ago) I purchased the domain name "theparabolagroupforum.com" and all was well. 2 days ago, I decided to delete it for something shorter.

Today I got an email from forumotion saying:

"Dear Forumotion user,

The deletion of your domain name will be effective within the next hours.
Your forum will now only be available by its default address.

You can buy a new domain name at any time in your admin panel > misc > buy credits.

Regards,
Forumotion team"

Sadly I don't remember my default address from oh so long ago, and don't know how to find it. If anyone has any suggestions, I'd love to hear them.

Solution:Google relentlessly.