dns01.ono.com has one IP number , which also has a corresponding reverse pointer. dns.ono.com cnames to this hostname. cob.es, fjd.es, emv.es, fab.es, elt.es and at least 100 other hosts use this as a nameserver. ono.com is a domain controlled by three nameservers at ono.com themselves. All of them are on the same IP network. Incoming mail for ono.com is handled by one mailserver also at ono.com. ono.com has one IP number. dns01.ono.com is hosted on a server in Spain.