ns4.sergas.es has one IP number , but the reverse is artemis.ttd.net. artemis.ttd.es, slave1.ccoo.es and artemis.ttd.net point to the same IP. sergas.es use this as a nameserver. sergas.es is delegated to five nameservers, however two delegated nameservers are missing in the zone. Two nameservers have the same IP number. All of them are on the same IP network. Incoming mail for sergas.es is handled by two mailservers at sergas.es themselves. They are on the same IP network. ns4.sergas.es is hosted on a server in Spain.