ns2.abac.com has one IP number , which also has a corresponding reverse pointer. abac.net, abac.com, pbih.com, aplus.net, hpodd.com and at least 100 other hosts use this as a nameserver. abac.com is a domain controlled by two nameservers at abac.com themselves. They are on the same IP network. Incoming mail for abac.com is handled by two mailservers also at abac.com. They are on different IP networks. abac.com has one IP number. ns2.abac.com is hosted on a server in United States.