ns1.google.com.tr has one IP number , but the reverse is ns1.google.com. tvojebaba.cz, ns1.google.de, ns1.google.tk, ns1.google.es, ns1.google.vn and at least 18 other hosts point to the same IP. google.com.tr is delegated to two nameservers, however two extra nameservers are listed in the zone. All nameservers are at google.com. All of them are on different IP networks. Incoming mail for google.com.tr is handled by four mailservers. All of them are on the same IP network. google.com.tr has three IP numbers. All of them are on different IP networks. ns1.google.com.tr is hosted on a server in United States even though the hostname implies Turkey.