ns1.turk.net has one IP number , which also has a corresponding reverse pointer. ns1.satko.com, ns1.satko.com.tr and ns1.netone.com.tr point to the same IP. ki.ki, tnn.net, ekol.com, turk.net, erku.com and at least 100 other hosts use this as a nameserver. turk.net is a domain controlled by two nameservers at turk.net themselves. They are on different IP networks. Incoming mail for turk.net is handled by two mailservers having a total of five IP numbers. All of them are on the same IP network. turk.net has one IP number. ns1.turk.net is hosted on a server in Turkey.