go
ns-tk021.ocn.ad.jp has one IP number , which also has a corresponding reverse pointer. my-j.net, aeba.net, m5588.net, prtec.net, kao.co.jp and at least 100 other hosts use this as a nameserver. ns1.ns-tk021.ocn.ad.jp are subdomains to this hostname. ocn.ad.jp is a domain controlled by two nameservers at ocn.ad.jp themselves. They are on different IP networks. Incoming mail for ocn.ad.jp is handled by two mailservers also at ocn.ad.jp. They are on the same IP network. ocn.ad.jp has two IP numbers. They are on the same IP network. ns-tk021.ocn.ad.jp is hosted on a server in Japan.

ns-tk021.ocn.ad.jp
a records
 
+ 203.139.160.103 203.139.160.0/19 AS4713 -
+ --- -

ocn.ad.jp
a records
 
+ 61.118.10.75 61.118.0.0/16 AS4713 gateway1.ocn.ad.jp
+ --- gateway1.ocn.ad.jp
+ 61.118.10.153 61.118.0.0/16 AS4713 gateway2.ocn.ad.jp
+ --- gateway2.ocn.ad.jp
ns-soa records
ns1.ocn.ad.jp
+ 202.234.232.202 202.234.192.0/18 AS4713 -
+ --- -
ns records
ns1.ocn.ad.jp
+ 202.234.232.202 202.234.192.0/18 AS4713 -
+ --- -
ns2.ocn.ad.jp
+ 211.129.12.204 211.129.0.0/16 AS4713 -
mx records
gateway1.ocn.ad.jp
+ 61.118.10.75 61.118.0.0/16 AS4713 -
+ --- -
gateway2.ocn.ad.jp
+ 61.118.10.153 61.118.0.0/16 AS4713 -
ip numbers of host
203.139.160.103
ptrs of ip numbers
ns-tk021.ocn.ad.jp
ip numbers using ptr to this host
203.139.160.103
domains using this as nameserver
32.150.in-addr.arpa
5608katsu9683.jp
997755.net
aaa-int.or.jp
aeba.net
aichi-sangyo.co.jp
ailesys.co.jp
akitakurikoma.com
ansin-life.net
asakita.net
asofan.net
aviva-intra.net
belbel.or.jp
bestrsv.com
chimaki.co.jp
cis-net.co.jp
did-daido.co.jp
digimeishi.net
diskunion.co.jp
diskunion.com
duks.co.jp
eikou.com
ele.hoya.co.jp
elfee.net
energy-save.net
fnet.ne.jp
fujikigroup.co.jp
fukudaya.net
fxc.co.jp
ginan.gifu.gifu.jp
gip-web.co.jp
gominet.com
h-kk.co.jp
hatarakuzo.jp
hosibune.net
ibridge.co.jp
ichian.com
imasen.co.jp
imgsrc.co.jp
infoworks.ne.jp
iso-jp.com
iwasaki-net.or.jp
japan-navy.net
jjnet.co.jp
jkenpo.net
josai.ac.jp
jsdpa.gr.jp
ju-car.net
kanamono.net
kao.co.jp
kk-ism.co.jp
komatsu-ele.co.jp
koyonet.com
kyoteiprc.com
kyoto-kem.com
m5588.net
masami.or.jp
mbs.co.jp
meijidenki.co.jp
melphin.net
midori-na.co.jp
mpci.co.jp
muroo.co.jp
my-j.net
nagaoka.or.jp
neive.co.jp
neurotec.co.jp
ngo.shoshin.co.jp
nhdenno.co.jp
nikkos.co.jp
ntt-tdkansai.co.jp
nyanko.net
ogawajihan.com
omc-net.org
opmex.com
piecake.com
players.ne.jp
pref.nagasaki.jp
producemedia.ne.jp
prtec.net
rakunan.net
rasis-soft.co.jp
realize-net.co.jp
sankai.ne.jp
satosyokuhin.co.jp
sdk-kk.co.jp
shigun.co.jp
shokuan.net
shudo-u.ac.jp
sjc.ne.jp
skylark.co.jp
snowland.co.jp
soft99.co.jp
softeria.net
sunsun-j.net
suruga-bkg.net
suruga-card.co.jp
suruga-csk.co.jp
talk.co.jp
tech.toyo-glass.co.jp
tenryu-kogyo.co.jp
teral.co.jp
tnk-tanaka.co.jp
tohogakuen.ac.jp
tokyoport.net
totsuki.co.jp
toyogosei.co.jp
toyoxsw.co.jp
trex.co.jp
tv-akagi.net
unirose.net
unix.gr.jp
vill.higashinaruse.akita.jp
wizc-m.net
www.e-onlinepaper.com
yodai.net
yuki-d.co.jp
zeiken.co.jp
zips.co.jp
zokei.ac.jp
subdomains
*.ns-tk021.ocn.ad.jp
ns1.ns-tk021.ocn.ad.jp
used as nameserver but missing in parent delegation
alpharm.co.jp
clarion-eng.co.jp
daie.com
futaba-bunka.ed.jp
godai.jp
hg-shinonome.co.jp
ibatokyo.or.jp
ibridge.co.jp
iyotetsu.co.jp
jemcci.jp
jsdpa.gr.jp
kashimaya.co.jp
konaya.jp
okunet.gr.jp
ome-tky.ed.jp
players.ne.jp
sannomaru-hotel.co.jp
shimodate-rc.gr.jp
shimodate-shisui-rc.jp
t-shakyo.or.jp
technet.co.jp
tv-akagi.net
wizc-m.net
used as nameserver but missing in zone
112.237.225.210.in-addr.arpa
50.151.222.in-addr.arpa
55.151.222.in-addr.arpa
58.151.222.in-addr.arpa
aeba.net
amamishell.com
amamishell.net
bay.solco.co.jp
belbel.or.jp
digimeishi.net
energy-save.net
gip-web.co.jp
himeji-med.or.jp
hosibune.net
japan-navy.net
ju-car.net
marukyu.com
nikkos.co.jp
notredame-e.ed.jp
opmex.com
ponon-st.com
sanokaku.com
saru-net.com
shigun.co.jp
shokuan.net
softeria.net
sunsun-j.net
suruga-card.co.jp
suruga-csk.co.jp
tohoku-ctr-hsp.com
tokyoport.net
yodai.net