go
mail.1blu.de has one IP number , which also has a corresponding reverse pointer. 1blu.de use this as a mailserver. 1blu.de is a domain controlled by two nameservers at ns1.de. They are on different IP networks. Incoming mail for 1blu.de is handled by one mailserver at 1blu.de themselves. 1blu.de has one IP number. mail.1blu.de is hosted on a server in Germany.

mail.1blu.de
a records
 
+ 213.83.63.131 213.83.0.0/18 AS12306 -
+ --- -

*.1blu.de
a records
 
+ 213.83.63.68 213.83.0.0/18 AS12306  
+ ---  

1blu.de
a records
 
+ 213.83.63.130 213.83.0.0/18 AS12306  
+ ---  
ns-soa records
ns.ns1.de
+ 82.149.248.3 82.149.224.0/19 AS29551 82-149-248-3.static.aixit.com
+ --- 82-149-248-3.static.aixit.com
ns records
ns.ns1.de
+ 82.149.248.3 82.149.224.0/19 AS29551 82-149-248-3.static.aixit.com
+ --- 82-149-248-3.static.aixit.com
ns1.ns1.de
+ 213.83.63.221 213.83.0.0/18 AS12306 rl31.1blu.de
+ --- rl31.1blu.de
mx records
mail.1blu.de
+ 213.83.63.131 213.83.0.0/18 AS12306 -
+ --- -
ip numbers of host
213.83.63.131
ptrs of ip numbers
mail.1blu.de
ip numbers using ptr to this host
213.83.63.131
domains using this as mailserver
1blu.de