go
pop.0bbs.jp has one IP number , which is the same as for 0bbs.jp. 0bbs.jp and www.0bbs.jp point to the same IP. leo.0bbs.jp use this as a mailserver. 0bbs.jp is a domain controlled by three nameservers. Two nameservers have the same IP number. They are on the same IP network. Incoming mail for 0bbs.jp is handled by one mailserver at jp. pop.0bbs.jp is hosted on a server in Japan.

pop.0bbs.jp
a records
 
+ 122.209.128.4 122.208.0.0/14 AS17506  
+ ---  

0bbs.jp
a records
 
+ 122.209.128.4 122.208.0.0/14 AS17506  
+ ---  
ns-soa records
leo.0bbs.jp
+ 210.189.163.129 210.189.160.0/21 AS23619 sun.uni-ty.com
+ --- sun.uni-ty.com
ns records
leo.0bbs.jp
+ 210.189.163.129 210.189.160.0/21 AS23619 sun.uni-ty.com
+ --- sun.uni-ty.com
osk.uni-ty.com
+ 122.213.187.2 122.212.0.0/14 AS17506 122x213x187x2.ap122.ftth.ucom.ne.jp
+ --- 122x213x187x2.ap122.ftth.ucom.ne.jp
sun.uni-ty.com
+ 210.189.163.129 210.189.160.0/21 AS23619 -
+ --- -
mx records
0bbs.jp
+ 122.209.128.4 122.208.0.0/14 AS17506  
+ ---  
ip numbers of host
122.209.128.4
hostnames sharing ip with a-records
0bbs.jp
www.0bbs.jp
domains using this as mailserver
leo.0bbs.jp
domains using this as mailserver under another name
0bbs.jp