*.lavoro.ch has one IP number , but the reverse is zapp.inwx.net. mov.dk, med1.ch, saug.us, iesy.com, mosit.eu and at least 100 other hosts point to the same IP. lavoro.ch is a domain controlled by three nameservers at inwx.de. All of them are on different IP networks. Incoming mail for lavoro.ch is handled by one mailserver having a total of two IP numbers. They are on the same IP network. lavoro.ch has one IP number. *.lavoro.ch is hosted on a server in Germany even though the hostname implies Switzerland.