Robtex

Up: 123.98.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 123.98.128.0/19
Down right: 123.98.160.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.98.144.0	PTR	123.98.144.0.static.zoot.jp
123.98.144.2	PTR	r-k5017.g44o.mobi
123.98.144.3	PTR	123.98.144.3.static.zoot.jp
123.98.144.6	A	123.98.144.6.static.zoot.jp
123.98.144.14	A	123.98.144.14.static.zoot.jp
123.98.144.25	A	123.98.144.25.static.zoot.jp
123.98.144.38	A	123.98.144.38.static.zoot.jp
123.98.144.64	A+PTR	123.98.144.64.static.zoot.jp
123.98.144.65	A+PTR	123.98.144.65.static.zoot.jp
123.98.144.66	PTR	123.98.144.66.static.zoot.jp
123.98.144.67	PTR	123.98.144.67.static.zoot.jp
123.98.144.75	A	123.98.144.75.static.zoot.jp
123.98.144.80	A	123.98.144.80.static.zoot.jp
123.98.144.128	PTR	123.98.144.128.static.zoot.jp
123.98.144.131	PTR	123.98.144.131.static.zoot.jp
123.98.145.0	PTR	123.98.145.0.static.zoot.jp
123.98.145.193	PTR	123.98.145.193.static.zoot.jp
123.98.146.1	PTR	123.98.146.1.static.zoot.jp
123.98.146.2	PTR	123.98.146.2.static.zoot.jp
123.98.146.64	PTR	123.98.146.64.static.zoot.jp
123.98.146.66	PTR	123.98.146.66.static.zoot.jp
123.98.146.195	PTR	123.98.146.195.static.zoot.jp
123.98.147.194	PTR	00rk09.u-in.mobi
123.98.147.195	PTR	00rk09.u-in.mobi
123.98.148.3	PTR	123.98.148.3.static.zoot.jp
123.98.148.192	PTR	123.98.148.192.static.zoot.jp
123.98.149.41	A	123.98.149.41.static.zoot.jp
123.98.149.50	A	123.98.149.50.static.zoot.jp
123.98.149.62	A	123.98.149.62.static.zoot.jp
123.98.149.132	A	123.98.149.132.static.zoot.jp
123.98.149.133	A	123.98.149.133.static.zoot.jp
123.98.149.191	A	123.98.149.191.static.zoot.jp
123.98.149.192	A+PTR	123.98.149.192.static.zoot.jp
123.98.149.193	PTR	123.98.149.193.static.zoot.jp
123.98.149.194	PTR	123.98.149.194.static.zoot.jp
123.98.149.198	A	123.98.149.198.static.zoot.jp
123.98.149.199	A	123.98.149.199.static.zoot.jp
123.98.149.245	A	123.98.149.245.static.zoot.jp
123.98.150.2	PTR	123.98.150.2.static.zoot.jp
123.98.150.67	PTR	123.98.150.67.static.zoot.jp
123.98.150.130	PTR	123.98.150.130.static.zoot.jp
123.98.151.64	PTR	r-k5001.2ozdboedvwsa.me.uk
123.98.151.65	PTR	r-k5001.2ozdboedvwsa.me.uk
123.98.151.131	PTR	123.98.151.131.static.zoot.jp
123.98.151.193	PTR	123.98.151.193.static.zoot.jp
123.98.152.6	A	123.98.152.6.static.zoot.jp
123.98.152.8	A	123.98.152.8.static.zoot.jp
123.98.152.11	A	123.98.152.11.static.zoot.jp
123.98.152.29	A	123.98.152.29.static.zoot.jp
123.98.152.89	A	123.98.152.89.static.zoot.jp
123.98.152.116	A	123.98.152.116.static.zoot.jp
123.98.152.131	PTR	123.98.152.131.static.zoot.jp
123.98.152.166	A	123.98.152.166.static.zoot.jp
123.98.152.171	A	123.98.152.171.static.zoot.jp
123.98.152.180	A	123.98.152.180.static.zoot.jp
123.98.152.229	A	123.98.152.229.static.zoot.jp
123.98.152.247	A	123.98.152.247.static.zoot.jp
123.98.153.2	PTR	00rk00.recv7.com
123.98.153.66	PTR	00rk00.recv7.com
123.98.153.194	PTR	00rk44.lr4d.biz
123.98.154.25	A	123.98.154.25.static.zoot.jp
123.98.155.13	A	123.98.155.13.static.zoot.jp
123.98.155.16	A	123.98.155.16.static.zoot.jp
123.98.155.64	A	123.98.155.64.static.zoot.jp
123.98.155.66	PTR	123.98.155.66.static.zoot.jp
123.98.155.129	PTR	123.98.155.129.static.zoot.jp
123.98.155.195	PTR	123.98.155.195.static.zoot.jp
123.98.156.130	PTR	123.98.156.130.static.zoot.jp
123.98.157.1	PTR	123.98.157.1.static.zoot.jp
123.98.157.61	A	123.98.157.61.static.zoot.jp
123.98.157.64	PTR	123.98.157.64.static.zoot.jp
123.98.157.64	A	mail.wqg16c35.net
123.98.157.64	A	mail.99k6h1pt.net
123.98.157.66	PTR	123.98.157.66.static.zoot.jp
123.98.157.139	A	123.98.157.139.static.zoot.jp
123.98.157.154	A	123.98.157.154.static.zoot.jp
123.98.157.182	A	123.98.157.182.static.zoot.jp
123.98.157.192	A+PTR	123.98.157.192.static.zoot.jp
123.98.157.193	PTR	00rk11.s-a2.mobi
123.98.157.218	A	123.98.157.218.static.zoot.jp
123.98.157.231	A	123.98.157.231.static.zoot.jp
123.98.157.251	A	123.98.157.251.static.zoot.jp
123.98.158.3	PTR	r-k5037.rumlet.biz
123.98.158.64	PTR	r-k5037.rumlet.biz
123.98.158.136	A	123.98.158.136.static.zoot.jp
123.98.159.0	PTR	123.98.159.0.static.zoot.jp
123.98.159.21	A	123.98.159.21.static.zoot.jp
123.98.159.36	A	123.98.159.36.static.zoot.jp
123.98.159.44	A	123.98.159.44.static.zoot.jp
123.98.159.81	A	123.98.159.81.static.zoot.jp
123.98.159.103	A	123.98.159.103.static.zoot.jp
123.98.159.128	PTR	123.98.159.128.static.zoot.jp
123.98.159.138	A	123.98.159.138.static.zoot.jp
123.98.159.166	A	123.98.159.166.static.zoot.jp
123.98.159.192	PTR	123.98.159.192.static.zoot.jp
123.98.164.22	A	yakollyeo.com
123.98.179.19	A	changwoo.pe.kr
123.98.182.209	A	vmddns.com
123.98.182.209	A	ns.vmddns.com