dns1.hcm.fpt.vn has one IP number , which also has a corresponding reverse pointer. dns13.fpt.vn and isp-web.hcm.fpt.vn point to the same IP. adc.vn, vcg.vn, thvl.vn, idea.vn, fpt.net and at least 100 other hosts use this as a nameserver. hcm.fpt.vn is a domain controlled by four nameservers. Some of them are on the same IP network. Incoming mail for hcm.fpt.vn is handled by three mailservers at hcm.fpt.vn themselves. All of them are on the same IP network. hcm.fpt.vn has one IP number. dns1.hcm.fpt.vn is hosted on a server in Vietnam.