ns5.ncsdi.ws has one IP number , but the reverse is mailrelay.79.website.ws. 1.ws, e.ws, my.ws, ws.ws, dvd.ws and at least 40 other hosts use this as a nameserver. ncsdi.ws is a domain controlled by four nameservers at ncsdi.ws themselves. Two of them are on the same IP network. Incoming mail for ncsdi.ws is handled by two mailservers also at ncsdi.ws. They are on different IP networks. ncsdi.ws has one IP number. ns5.ncsdi.ws is hosted on a server in United States even though the hostname implies Samoa.