2.sisco.pl has one IP number , but the reverse is srv32-www.ogicom.pl. ahf.pl, aru.pl, wroc.ws, pzp-n.pl, netax.pl and at least 100 other hosts point to the same IP. sisco.pl is a domain controlled by two nameservers at sisco.pl themselves. They are on different IP networks. Incoming mail for sisco.pl is handled by two mailservers also at sisco.pl. Two mailservers have the same IP number. sisco.pl has one IP number. 2.sisco.pl is hosted on a server in Poland.