What is necessary to "LOCK" an account at the creation IP?

A friend of mine told me it is possible to "LOCK" my account at my IP. Something like: The information of my account can only be requested from my ip. Because recently a guy told me he is going to hack me soon because he hates me --' haha no comments but he is used to hack a lot of accounts and im afraid. Hope i can be helpped because i sent a support ticket like 1 week ago and no reply yet. :D
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