dns.atman.pl has one IP number , but the reverse is ans1.atman.pl. ans1.atman.pl point to the same IP. idg.pl, tvp.pl, arp.pl, ing.pl, cxo.pl and at least 100 other hosts use this as a nameserver. root.dns.atman.pl are subdomains to this hostname. atman.pl is delegated to two nameservers, however one extra nameserver is listed in the zone. All of them are on different IP networks. Incoming mail for atman.pl is handled by one mailserver at atm.com.pl. atman.pl has one IP number. dns.atman.pl is hosted on a server in Poland.