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ra.bsis.bellsouth.net has one IP number , which also has a corresponding reverse pointer. bsis.bellsouth.net has one IP number. ra.bsis.bellsouth.net is hosted on a server in United States.

ra.bsis.bellsouth.net
a records
 
+ 216.77.188.42 216.77.188.0/24 AS6389 -
+ --- -

bsis.bellsouth.net
a records
 
+ 216.77.188.41 216.77.188.0/24 AS6389  
+ ---  
ip numbers of host
216.77.188.42
ptrs of ip numbers
ra.bsis.bellsouth.net
ip numbers using ptr to this host
216.77.188.42