As much as I don't want to disagree with Tiggs, I am pretty sure it's www.irs.gov then go to check status of Stimulus check. It asks certain questions that only you know the answer to and then it will, or it should if you answer the questions correctly, give you an update on the status of your rebate check.
Knutters is right. It is www.irs.gov maybe tiggs had a typo. I have used it several times for several people you can find out anything about the stimulus checks and much more. Just read them very carefully as I have found the difference between direct deposit and mailing is if you paid for your fees out of your refund then even if you received direct deposit you will get a mail check.
You can go to www.4.irs.gov. This should take you right to the site, and all you do there is follow the prompts. Hope this helps you out.
Go to www.irs.gov and it will tell you when it was sent out and how much you will be getting back