go
mail.edwinboer.com and c63204.upc-c.chello.nl point to 212.187.63.204.

c63204.upc-c.chello.nl
a records
 
+ 212.187.63.204 212.187.0.0/18 AS6830 -
+ --- -

mail.edwinboer.com
a records
 
+ 212.187.63.204 212.187.0.0/18 AS6830 c63204.upc-c.chello.nl
+ --- c63204.upc-c.chello.nl
ip numbers of host
212.187.63.204
ptrs of ip numbers
c63204.upc-c.chello.nl
hostnames sharing ip with a-records
c63204.upc-c.chello.nl
mail.edwinboer.com