ns2.vuurwerk.nl has one IP number , but the reverse is ns2.vuurwerk.net. ns2.vuurwerk.net point to the same IP. pyng.nl, goal.net, kisys.nl, thehun.com, graydon.nl and at least eight other hosts use this as a nameserver. vuurwerk.nl is a domain controlled by three nameservers. All of them are on different IP networks. Incoming mail for vuurwerk.nl 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. ns2.vuurwerk.nl is hosted on a server in Netherlands.