lx.az.pl has one IP number , which also has a corresponding reverse pointer. ns1.az.pl and rapidchoice.com point to the same IP. ome.pl, sej.pl, icsx.pl, n-dv.pl, j2ee.pl and at least 100 other hosts use this as a nameserver. az.pl is a domain controlled by two nameservers at az.pl themselves. They are on the same IP network. Incoming mail for az.pl is handled by one mailserver also at az.pl. az.pl has one IP number. lx.az.pl is hosted on a server in Poland.