Does IP bans block registrations??

In an attempt to limit the amount of spam on the forum I have been blocking certain IPs with a network rage of x.x.x.*
By checking "Active Users" I can see who is access which part of the forum and with what assigned IP address.
To my surprise I found that someone was registering yet another spambot account with the same IP, an IP range I had blocked the previous day.

Am I to understand that IP bans do not prevent new user accounts or am I seeing this user access the page that was being denied??

While on the subject of spam controls we're currently using WebWiz version 9.70 and I understand it has a "bad word filter" option.

Does this deny posts with banned words, and common email addresses i.e. hotmail being used for registration??

So far I've seen nothing for editing bad words so I'm guessing this isn't available to Moderators.

Richard S.