relay3.nedcomp.nl has one IP number , which also has a corresponding reverse pointer. mail1.nedcomp.nl point to the same IP. ski.be, a-b.nl, iak.nl, nha.nl, hvh.nl and at least 100 other hosts use this as a mailserver. nedcomp.nl is a domain controlled by two nameservers on different IP networks. Incoming mail for nedcomp.nl is handled by four mailservers at nedcomp.nl themselves. All of them are on the same IP network. relay3.nedcomp.nl is hosted on a server in Netherlands.