Robtex

Up: 121.52.70.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 121.52.71.0/25
Down right: 121.52.71.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.52.71.10	PTR	commbankindo.com
121.52.71.10	PTR	mymailanywhere.org
121.52.71.20	PTR	arenaseluler.com
121.52.71.20	PTR	baitul-alaa.com
121.52.71.20	PTR	setjawilastra.com
121.52.71.22	PTR	backup.hosting.xl.net.id
121.52.71.22	A	mail2.teamworx.co.id
121.52.71.24	PTR	hosting.xl.net.id
121.52.71.25	PTR	hosting.xl.net.id
121.52.71.29	PTR	xl.net.id
121.52.71.50	PTR	mail.kalbenutritionals.com
121.52.71.50	A	mail10.mommychi.co.id
121.52.71.50	A	mail01.morinagaplatinum.com
121.52.71.52	PTR	mail.kalbenutritionals.com
121.52.71.117	A	monitoring.xl.net.id
121.52.71.120	A	tornado.xl.net.id
121.52.71.132	PTR	shot2nd.antam.com.71.52.121.in-addr.arpa
121.52.71.134	PTR	shot4.antam.com
121.52.71.158	PTR	mail.cjp-jkt.co.id
121.52.71.158	PTR	mail.pt-cjp.co.id
121.52.71.158	PTR	mail.pt-sn.co.id
121.52.71.166	PTR	mail.petrosea.com