ns1.oleane.net has one IP number , which also has a corresponding reverse pointer. ns3.ext.nic.fr point to the same IP. bhv.fr, bmw.fr, abg.fr, atd.fr, afd.fr and at least 100 other hosts use this as a nameserver. arpe-mip.com use this as a mailserver. oleane.net is a domain controlled by three nameservers. Two of them are on the same IP network. Incoming mail for oleane.net is handled by one mailserver at dih.oleane.net. ns1.oleane.net is hosted on a server in France.