as-3.mail.vuurwerk.net has one IP number , which also has a corresponding reverse pointer. mx.vuurwerk.nl and mx2.vuurwerk.nl point to the same IP. go.nl, w8.nl, i-c.nl, xtl.nl, sho.nl and at least 100 other hosts use this as a mailserver. mail.vuurwerk.net is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for mail.vuurwerk.net is handled by five mailservers having a total of three IP numbers. There are six duplicated IP numbers. Some of them are on the same IP network. as-3.mail.vuurwerk.net is hosted on a server in Netherlands.