mx2.uni5.net has one IP number , which also has a corresponding reverse pointer. mx2.stwnet.com, mx2.dyk.com.br, mx2.jot.com.br, mx2.wew.com.br, mx2.dmz.com.br and at least 100 other hosts point to the same IP. uni5.net use this as a mailserver. uni5.net is delegated to two nameservers, however both delegated nameservers are missing in the zone. All nameservers are at uni5.net themselves. They are on the same IP network. Incoming mail for uni5.net is handled by two mailservers also at uni5.net. They are on the same IP network. uni5.net has one IP number. mx2.uni5.net is hosted on a server in Brazil.