ins.dell.com is a domain controlled by three nameservers at us.dell.com. All of them are on the same IP network. lt.ins.dell.com, wpd.ins.dell.com, ftp.ins.dell.com, smtp.ins.dell.com, rict.ins.dell.com and at least 30 other hosts are subdomains to this hostname. dell.com is a domain controlled by five nameservers also at us.dell.com. All of them are on the same IP network. Incoming mail for dell.com is handled by two mailservers having a total of four IP numbers. All of them are on the same IP network. dell.com has two IP numbers. They are on the same IP network.