Incoming mail for c.nsf.jp is handled by one mailserver at nsf.jp. c.nsf.jp has one IP number , which also has a corresponding reverse pointer. kgkl.net, 1dote.com, ncsjp.com, ps1315.com, 385-59.com and at least 99 other hosts point to the same IP. c.nsf.jp use this as a mailserver. nsf.jp is delegated to five nameservers, however two delegated nameservers are missing in the zone. All nameservers are at value-domain.com. Two of them are on the same IP network. Incoming mail for nsf.jp is handled by one mailserver also at nsf.jp. nsf.jp has one IP number , but the reverse is www.nsf.jp. c.nsf.jp is hosted on a server in Japan.