Incoming mail for s.nsf.jp is handled by one mailserver at nsf.jp. s.nsf.jp has one IP number , which also has a corresponding reverse pointer. m-md.net, vwman.net, and-j.com, naibi.net, 5022e.com and at least 100 other hosts point to the same IP. s.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. s.nsf.jp is hosted on a server in Japan.