a.ns.coptix.com and b.ns.coptix.com are subdomains to this hostname. coptix.com is a domain controlled by two nameservers at ns.coptix.com. They are on different IP networks. Incoming mail for coptix.com is handled by seven mailservers having a total of 28 IP numbers. Some of them are on the same IP network. coptix.com has one IP number.