go
sk2.yamashita.ne.jp has one IP number , which is the same as for yamashita.ne.jp, but the reverse is cyan.kutikomi.net. pop.samgha.jp, yamashita.ne.jp, cyan.kutikomi.net, sk.yamashita.ne.jp, pop.access-j.co.jp and at least three other hosts point to the same IP. yamashita.ne.jp is delegated to three nameservers, however one delegated nameserver is missing in the zone. All nameservers are at uni-ty.com. All of them are on different IP networks. Incoming mail for yamashita.ne.jp is handled by one mailserver at yamashita.ne.jp themselves. sk2.yamashita.ne.jp is hosted on a server in Japan.

sk2.yamashita.ne.jp
a records
 
+ 210.189.163.130 210.189.160.0/21 AS23619 cyan.kutikomi.net
+ --- cyan.kutikomi.net

yamashita.ne.jp
a records
 
+ 210.189.163.130 210.189.160.0/21 AS23619 cyan.kutikomi.net
+ --- cyan.kutikomi.net
ns-soa records
sun.uni-ty.com
+ 210.189.163.129 210.189.160.0/21 AS23619 -
+ --- -
ns records
osk3.uni-ty.com
+   AS?  
+ ---  
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
pop.yamashita.ne.jp
+   AS?  
+ ---  
ip numbers of host
210.189.163.130
ptrs of ip numbers
cyan.kutikomi.net
hostnames sharing ip with a-records
cyan.kutikomi.net
pop.access-j.co.jp
pop.kazuya-yamashita.jp
pop.pluscraft.co.jp
pop.samgha.jp
sk.yamashita.ne.jp
sun.yamashita.ne.jp
yamashita.ne.jp
domains using this as mailserver under another name
access-j.co.jp
kazuya-yamashita.jp
pluscraft.co.jp
samgha.jp
nameservers missing in zone
osk3.uni-ty.com