I would also recommend/suggest the one posted by JB.
One can press the "Profile and History for this XXXX".
Restrictions may apply for visitors, it means you can only do a certain search, I think after a few hits it stops. I don't remember how many hits one gets, cause I have a subscription with them. It's very useful.
The Airfleets is only a secondary, but works just as good, not up to date though, I think it's behind like 2 weeks, I have emailed Airfleets and often updated some re-registrations of SAS and Philippine Airlines.
Anyhow go to this ATDB.
AeroTransport Data Bank