ftp.myinet.pl has one IP number , which also has a corresponding reverse pointer. dns4.inet.pl and dns2.myinet.pl point to the same IP. myinet.pl is a domain controlled by two nameservers at myinet.pl themselves. They are on the same IP network. Incoming mail for myinet.pl is handled by one mailserver also at myinet.pl. myinet.pl has one IP number , which also has a corresponding reverse pointer. ftp.myinet.pl is hosted on a server in Poland.