Re-registered banned user killer

[Spinball]

Hi folks.
Here's a nice challenge for you.
We have an abundance of banned morons who re-register over and over.
How about a little script which goes through all the banned user groups and shows in a table, the names of the banned users, their IP addresses used, the reason why they were banned and the ban dates?
And then for each banned user a list of registered users with registration or post IP addresses which match, their list of IP addresses, plus the date they registered.
In this way we can spot (with the help of matching IPs and the ban/join dates) re-registered banned members.
A very useful tool for over-run admins.
I thank you for your attention.