ns2-old.gts.cz has one IP number , which also has a corresponding reverse pointer. ns2.sbone.cz, ns2.inecnet.cz and hubserv.gts.cz point to the same IP. gts.cz is a domain controlled by two nameservers at inecnet.cz. They are on different IP networks. Incoming mail for gts.cz is handled by two mailservers on different IP networks. gts.cz has one IP number. ns2-old.gts.cz is hosted on a server in Czech Republic.