ftp.xls.hu has one IP number , which is the same as for xls.hu, but the reverse is mail.xls.hu. xls.hu, hart.hu, ozin.hu, ensi.hu, dinax.hu and at least 35 other hosts point to the same IP. xls.hu is a domain controlled by three nameservers having a total of four IP numbers. All of them are on different IP networks. Incoming mail for xls.hu is handled by one mailserver at xls.hu themselves. ftp.xls.hu is hosted on a server in Hungary.