dns1.vc3.com has one IP number , which also has a corresponding reverse pointer. vc3.com, tjr.com, gihp.us, masc.sc, iop.net and at least 100 other hosts use this as a nameserver. admin.dns1.vc3.com and hostmaster.dns1.vc3.com are subdomains to this hostname. vc3.com is a domain controlled by three nameservers at vc3.com themselves. Two of them are on the same IP network. Incoming mail for vc3.com is handled by two mailservers also at vc3.com. They are on the same IP network. vc3.com has one IP number. dns1.vc3.com is hosted on a server in United States.