ns2.fortis.com has one IP number , which also has a corresponding reverse pointer. mine.be, acred.be, fortis.fr, fortis.ag, fortis.nl and at least 99 other hosts use this as a nameserver. fortis.com is a domain controlled by four nameservers. Two of them are on the same IP network. Incoming mail for fortis.com is handled by four mailservers at fortis.com themselves. All of them are on the same IP network. fortis.com has one IP number. ns2.fortis.com is hosted on a server in Belgium.