If you use our name servers it would look like NS1.HOSTSTORE.COM and NS2.HOSTSTORE.COM
Our Resellers have the option to use private name servers which would look like:

NS1.YOURDOMAIN.COM
NS2.YOURDOMAIN.COM


A reseller might want this for branding and anonymity reasons.
Please submit a support ticket if you would like private name servers for your reseller account.