sharepoint.iu.edu is a domain controlled by two nameservers at iu.edu. They are on different IP networks. iu.edu, iub.edu, bio.net, nlr.net, iuk.edu and at least 88 other hosts share nameservers with this domain. exchange.sharepoint.iu.edu are subdomains to this hostname. iu.edu is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for iu.edu is handled by one mailserver at indiana.edu.