ns01.webone.ch has one IP number , but the reverse is ns1.dns.regsol.net. ns1.wmc.de, ns1.ci1.de, dnszone.de, ns1.g-s.ch, ns1.wo4.net and at least 100 other hosts point to the same IP. webone.ch is a domain controlled by two nameservers at webone.ch themselves. They are on the same IP network. Incoming mail for webone.ch is handled by four mailservers having a total of eight IP numbers. There are two duplicated IP numbers. Some of them are on the same IP network. webone.ch has one IP number. ns01.webone.ch is hosted on a server in Germany even though the hostname implies Switzerland.