mailhost.ttd.net has one IP number , which also has a corresponding reverse pointer. ico.es, ttd.net, fice.es, nisa.es, hero.es and at least 100 other hosts use this as a mailserver. ttd.net is a domain controlled by two nameservers at ttd.net themselves. They are on the same IP network. Incoming mail for ttd.net is handled by two mailservers also at ttd.net. They are on the same IP network. mailhost.ttd.net is hosted on a server in Spain.