Incoming mail for ns2.itb.edu is handled by one mailserver at itb.edu. ns2.itb.edu has one IP number , but the reverse is ns2.itb.ac.id. ns2.itb.ac.id point to the same IP. ns2.itb.edu use this as a mailserver. itb.edu is a domain controlled by three nameservers at itb.ac.id having a total of four IP numbers. Two of them are on the same IP network. Incoming mail for itb.edu is handled by one mailserver at pamx1.hotmail.com. ns2.itb.edu is hosted on a server in Indonesia.