The IPv4 (and IPv6, if enabled) addresses listed at the bottom of the Site Information page, under "Web Site IP Addresses," are used by our web servers. They are not alternate addresses for our name servers. They are provided for reference only and almost never need to be used e.g. from DNS records.
For more information about how those IP addresses work with our service, see this entry.
If you are trying to obtain DNS name server information, please read this entry.