ns1.coltfrance.com has one IP number , which also has a corresponding reverse pointer. ns1.imaginet.net point to the same IP. g8.fr, cmn.fr, oth.fr, idp.fr, ab3.be and at least 100 other hosts use this as a nameserver. coltfrance.com is a domain controlled by two nameservers at coltfrance.com themselves. They are on different IP networks. Incoming mail for coltfrance.com is handled by one mailserver having a total of two IP numbers. They are on the same IP network. ns1.coltfrance.com is hosted on a server in Germany.