I want to ask if i can do more accounts(bitcointalk account) in one IP address?
I believe it is possible. Just try it. Maybe you need different email addresses for registration...
But why do you want more as one account? Do you want scam someone?
you can have multiple account with same ip address however you need different email for registrations . or you can put anything on email option or leave it with some random words no matter . but putting email will help you in recovering your account.
your posts need to be constructive .