All new Registrations are manually reviewed and approved, so a short delay after registration may occur before your account becomes active.
Inverse DNS tools?
Yes, not a typo.
Some user in LEB/LET had a website with network tools to do dns, ping, trace and other tasks. But that site has a tool to do a query via IP and get the domains hosted in that IP.
Unfortunately I don't remember that site or the user. If someone knows, please tell me, I need something like that n_n