my.home.net.pl has one IP number , which is the same as for home.net.pl, via cname to home.pl , which also has a corresponding reverse pointer. my.v.pl, my.xo.pl, homenet.pl, artbale.pl, home.net.pl and at least 54 other hosts point to the same IP. home.net.pl is a domain controlled by three nameservers at home.pl. All of them are on different IP networks. Incoming mail for home.net.pl is handled by two mailservers at home.net.pl themselves. They are on different IP networks. my.home.net.pl is hosted on a server in Poland.