Different hosts have different numbers of name servers, but they all serve the same purpose. In other words, if you're transferring your domain over and you'reupdating the name servers, then you simply need to match what the host is using. For example:
Your old host's name servers:
When you transfer, you only need to update to the two name servers for InMotion Hosting, as per below:
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Community Support Team
As it turns out, when you update 2 of the 4 name servers on register.com (leaving the other 2 blank), register.com automatically deletes the extra name servers.