ns4.ns5.com.br has one IP number , but the reverse is ns4.com.br. ns4.com.br, ns4.ns3.com.br, ns4.ns4.com.br, ns4.ns1.com.br, ns4.dbweb.com.br and at least one other host point to the same IP. ns5.com.br use this as a nameserver. ns5.com.br is delegated to five nameservers, however all five delegated nameservers are missing in the zone and five other nameservers are listed instead. There are four duplicated IP numbers. Some of them are on the same IP network. Incoming mail for ns5.com.br is handled by five mailservers at ns1.com.br. Some of them are on the same IP network. ns5.com.br has one IP number , which also has a corresponding reverse pointer. ns4.ns5.com.br is hosted on a server in Brazil.