Robtex

Up: 203.137.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 203.137.192.0/19
Down right: 203.137.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.137.192.4	A+PTR	jqzinj.tokyo
203.137.192.4	A	www.jqzinj.tokyo
203.137.192.5	A+PTR	nwewwg.tokyo
203.137.192.5	A	www.nwewwg.tokyo
203.137.192.6	PTR	kyfdda.tokyo
203.137.192.8	PTR	203-137-192-8.monstera.jp-west.compute.idcfcloud.net
203.137.192.67	A+PTR	203-137-192-67.monstera.jp-west.compute.idcfcloud.net
203.137.192.67	A	ns.swiyr.com
203.137.192.67	A	mail.swiyr.com
203.137.192.68	PTR	203-137-192-68.monstera.jp-west.compute.idcfcloud.net
203.137.192.86	PTR	203-137-192-86.monstera.jp-west.compute.idcfcloud.net
203.137.192.90	PTR	203-137-192-90.monstera.jp-west.compute.idcfcloud.net
203.137.192.142	A+PTR	203-137-192-142.monstera.jp-west.compute.idcfcloud.net
203.137.192.142	A	appdepart.jp
203.137.192.156	PTR	203-137-192-156.monstera.jp-west.compute.idcfcloud.net
203.137.192.156	A	ns.neygh.com
203.137.192.156	A	neygh.com
203.137.192.158	PTR	203-137-192-158.monstera.jp-west.compute.idcfcloud.net
203.137.192.159	PTR	203-137-192-159.monstera.jp-west.compute.idcfcloud.net
203.137.192.193	A+PTR	203-137-192-193.monstera.jp-west.compute.idcfcloud.net
203.137.192.193	A	sbr133.com
203.137.192.193	A	sbr132.com
203.137.192.209	PTR	203-137-192-209.monstera.jp-west.compute.idcfcloud.net
203.137.192.214	PTR	203-137-192-214.monstera.jp-west.compute.idcfcloud.net
203.137.192.223	PTR	203-137-192-223.monstera.jp-west.compute.idcfcloud.net
203.137.193.5	A+PTR	203-137-193-5.monstera.jp-west.compute.idcfcloud.net
203.137.193.5	A	mail.quouh.com
203.137.193.5	A	quouh.com
203.137.193.7	PTR	203-137-193-7.monstera.jp-west.compute.idcfcloud.net
203.137.193.8	PTR	203-137-193-8.monstera.jp-west.compute.idcfcloud.net
203.137.193.9	PTR	203-137-193-9.monstera.jp-west.compute.idcfcloud.net
203.137.193.95	A+PTR	itjaqv.tokyo
203.137.193.95	A	www.itjaqv.tokyo
203.137.193.101	A+PTR	203-137-193-101.monstera.jp-west.compute.idcfcloud.net
203.137.193.101	A	kitakyu-hp.or.jp
203.137.193.102	PTR	203-137-193-102.monstera.jp-west.compute.idcfcloud.net
203.137.193.110	PTR	203-137-193-110.monstera.jp-west.compute.idcfcloud.net
203.137.193.148	A+PTR	203-137-193-148.monstera.jp-west.compute.idcfcloud.net
203.137.193.148	A	pitabest.com
203.137.193.151	A+PTR	203-137-193-151.monstera.jp-west.compute.idcfcloud.net
203.137.193.151	A	ij-eng.com
203.137.193.159	PTR	203-137-193-159.monstera.jp-west.compute.idcfcloud.net
203.137.193.215	A+PTR	203-137-193-215.monstera.jp-west.compute.idcfcloud.net
203.137.193.215	A	yanagicho-pta.com
203.137.193.233	A+PTR	203-137-193-233.monstera.jp-west.compute.idcfcloud.net
203.137.193.233	A	mw9bgraxtf.com
203.137.193.236	PTR	203-137-193-236.monstera.jp-west.compute.idcfcloud.net
203.137.193.238	PTR	203-137-193-238.monstera.jp-west.compute.idcfcloud.net
203.137.194.8	PTR	superhotel.co.jp
203.137.194.8	A	www.superhoteljapan.com
203.137.194.38	A+PTR	203-137-194-38.monstera.jp-west.compute.idcfcloud.net
203.137.194.38	A	nisshofarm.com
203.137.194.52	PTR	superhotel.co.jp
203.137.194.52	A	f-seiryou.com
203.137.194.78	A+PTR	203-137-194-78.monstera.jp-west.compute.idcfcloud.net
203.137.194.78	A	movmov.net
203.137.194.211	A	dns2.lolipop.jp
203.137.195.144	A	k.syosetu.com
203.137.195.144	A	nk.syosetu.com
203.137.196.236	A	uns02.lolipop.jp
203.137.197.27	PTR	203-137-197-27.monstera.jp-west.compute.idcfcloud.net
203.137.197.27	A	ns01.xaas.jp
203.137.197.57	A+PTR	203-137-197-57.monstera.jp-west.compute.idcfcloud.net
203.137.197.57	A	t-smtp1.test-xaas.jp
203.137.197.104	A	www.cstomato.co.jp
203.137.197.104	A	ecoinnovation.co.jp
203.137.197.246	A+PTR	203-137-197-246.monstera.jp-west.compute.idcfcloud.net
203.137.197.246	A	room-bk-akashi.com
203.137.199.196	A+PTR	203-137-199-196.monstera.jp-west.compute.idcfcloud.net
203.137.199.196	A	sbr104.com
203.137.237.27	A	prsindia.net