Still not practical IMO. Many large ISP's cover a very large range of IPs so you can simply use 195.195.195.X which would allow only 255 dynamic IPs. If you go one step up to 195.195.x.x it may not be sufficient since some of the ISPs have different IP ranges like 195.195.195.x and 202.202.202.x. Let alone users using 2 ISPs (how/work) like me.
Besides there is another problem with specifying IPs. If user choose an range, he can change it too (say he changed ISP). Then account sharing user can also use this feature can't he?
I think your best bet would be using the default "Find IP of the user" feature in Admin CP for suspicious user accounts.
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