Robtex

Up: 123.51.218.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.51.219.0/25
Down right: 123.51.219.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.51.219.2	PTR	123-51-219-2.adsl.static.sparqnet.net
123.51.219.3	PTR	123-51-219-3.adsl.static.sparqnet.net
123.51.219.5	PTR	123-51-219-5.adsl.static.sparqnet.net
123.51.219.7	PTR	123-51-219-7.adsl.static.sparqnet.net
123.51.219.8	PTR	123-51-219-8.adsl.static.sparqnet.net
123.51.219.10	PTR	123-51-219-10.adsl.static.sparqnet.net
123.51.219.10	A	www.organicshop.com.tw
123.51.219.10	A	organicshop.com.tw
123.51.219.14	PTR	123-51-219-14.adsl.static.sparqnet.net
123.51.219.15	PTR	123-51-219-15.adsl.static.sparqnet.net
123.51.219.20	PTR	123-51-219-20.adsl.static.sparqnet.net
123.51.219.25	PTR	123-51-219-25.adsl.static.sparqnet.net
123.51.219.27	PTR	123-51-219-27.adsl.static.sparqnet.net
123.51.219.29	PTR	123-51-219-29.adsl.static.sparqnet.net
123.51.219.34	PTR	123-51-219-34.adsl.static.sparqnet.net
123.51.219.38	PTR	123-51-219-38.adsl.static.sparqnet.net
123.51.219.40	PTR	tvbs.com.tw
123.51.219.40	PTR	tvbsweekly.com.tw
123.51.219.40	A	mail.tvbs.com.tw
123.51.219.42	PTR	tvbs.com.tw
123.51.219.42	A	pr.tvbs.com.tw
123.51.219.43	PTR	123-51-219-43.adsl.static.sparqnet.net
123.51.219.44	PTR	tvbs.com.tw
123.51.219.45	A	countless.com.tw
123.51.219.46	PTR	tvbs.com.tw
123.51.219.46	A	epaper.tvbs.com.tw
123.51.219.46	A	web.tvbs.com.tw
123.51.219.47	PTR	123-51-219-47.adsl.static.sparqnet.net
123.51.219.47	A	mail.tvbsweekly.com.tw
123.51.219.49	PTR	123-51-219-49.adsl.static.sparqnet.net
123.51.219.54	PTR	123-51-219-54.adsl.static.sparqnet.net
123.51.219.55	PTR	123-51-219-55.adsl.static.sparqnet.net
123.51.219.55	A	ysred.com.tw
123.51.219.61	PTR	123-51-219-61.adsl.static.sparqnet.net
123.51.219.62	PTR	123-51-219-62.adsl.static.sparqnet.net
123.51.219.65	PTR	123-51-219-65.adsl.static.sparqnet.net
123.51.219.65	A	ns3.quanmax.com
123.51.219.65	A	ns3.kontron-asia.com
123.51.219.67	PTR	123-51-219-67.adsl.static.sparqnet.net
123.51.219.68	PTR	123-51-219-68.adsl.static.sparqnet.net
123.51.219.70	PTR	123-51-219-70.adsl.static.sparqnet.net
123.51.219.72	PTR	123-51-219-72.adsl.static.sparqnet.net
123.51.219.77	PTR	123-51-219-77.adsl.static.sparqnet.net
123.51.219.80	PTR	123-51-219-80.adsl.static.sparqnet.net
123.51.219.84	PTR	123-51-219-84.adsl.static.sparqnet.net
123.51.219.86	PTR	123-51-219-86.adsl.static.sparqnet.net
123.51.219.87	PTR	123-51-219-87.adsl.static.sparqnet.net
123.51.219.88	PTR	123-51-219-88.adsl.static.sparqnet.net
123.51.219.89	PTR	123-51-219-89.adsl.static.sparqnet.net
123.51.219.90	PTR	123-51-219-90.adsl.static.sparqnet.net
123.51.219.92	PTR	123-51-219-92.adsl.static.sparqnet.net
123.51.219.93	PTR	123-51-219-93.adsl.static.sparqnet.net
123.51.219.95	PTR	123-51-219-95.adsl.static.sparqnet.net
123.51.219.100	PTR	123-51-219-100.adsl.static.sparqnet.net
123.51.219.101	PTR	123-51-219-101.adsl.static.sparqnet.net
123.51.219.105	PTR	123-51-219-105.adsl.static.sparqnet.net
123.51.219.108	PTR	123-51-219-108.adsl.static.sparqnet.net
123.51.219.112	PTR	123-51-219-112.adsl.static.sparqnet.net
123.51.219.116	PTR	123-51-219-116.adsl.static.sparqnet.net
123.51.219.120	PTR	123-51-219-120.adsl.static.sparqnet.net
123.51.219.122	PTR	123-51-219-122.adsl.static.sparqnet.net
123.51.219.122	A	admail.csd.org.tw
123.51.219.126	PTR	123-51-219-126.adsl.static.sparqnet.net
123.51.219.128	PTR	123-51-219-128.adsl.static.sparqnet.net
123.51.219.138	PTR	123-51-219-138.adsl.static.sparqnet.net
123.51.219.144	PTR	123-51-219-144.adsl.static.sparqnet.net
123.51.219.145	PTR	123-51-219-145.adsl.static.sparqnet.net
123.51.219.146	PTR	123-51-219-146.adsl.static.sparqnet.net
123.51.219.150	PTR	123-51-219-150.adsl.static.sparqnet.net
123.51.219.153	PTR	123-51-219-153.adsl.static.sparqnet.net
123.51.219.154	PTR	123-51-219-154.adsl.static.sparqnet.net
123.51.219.161	PTR	123-51-219-161.adsl.static.sparqnet.net
123.51.219.163	PTR	123-51-219-163.adsl.static.sparqnet.net
123.51.219.163	A	aw.tdcc.com.tw
123.51.219.165	PTR	123-51-219-165.adsl.static.sparqnet.net
123.51.219.172	PTR	123-51-219-172.adsl.static.sparqnet.net
123.51.219.175	PTR	123-51-219-175.adsl.static.sparqnet.net
123.51.219.179	PTR	123-51-219-179.adsl.static.sparqnet.net
123.51.219.181	PTR	123-51-219-181.adsl.static.sparqnet.net
123.51.219.182	PTR	123-51-219-182.adsl.static.sparqnet.net
123.51.219.189	PTR	123-51-219-189.adsl.static.sparqnet.net
123.51.219.192	PTR	123-51-219-192.adsl.static.sparqnet.net
123.51.219.192	A	www.isnis.com.tw
123.51.219.192	A	isnis.com.tw
123.51.219.193	A+PTR	mail.isnis.com.tw
123.51.219.195	PTR	123-51-219-195.adsl.static.sparqnet.net
123.51.219.196	PTR	123-51-219-196.adsl.static.sparqnet.net
123.51.219.198	PTR	123-51-219-198.adsl.static.sparqnet.net
123.51.219.200	A	mail.mwti.com.tw
123.51.219.204	PTR	123-51-219-204.adsl.static.sparqnet.net
123.51.219.205	PTR	123-51-219-205.adsl.static.sparqnet.net
123.51.219.215	PTR	123-51-219-215.adsl.static.sparqnet.net
123.51.219.218	PTR	123-51-219-218.adsl.static.sparqnet.net
123.51.219.220	PTR	123-51-219-220.adsl.static.sparqnet.net
123.51.219.221	PTR	123-51-219-221.adsl.static.sparqnet.net
123.51.219.222	PTR	123-51-219-222.adsl.static.sparqnet.net
123.51.219.226	PTR	123-51-219-226.adsl.static.sparqnet.net
123.51.219.229	PTR	123-51-219-229.adsl.static.sparqnet.net
123.51.219.232	PTR	123-51-219-232.adsl.static.sparqnet.net
123.51.219.235	PTR	123-51-219-235.adsl.static.sparqnet.net
123.51.219.236	PTR	123-51-219-236.adsl.static.sparqnet.net
123.51.219.237	PTR	123-51-219-237.adsl.static.sparqnet.net
123.51.219.247	PTR	123-51-219-247.adsl.static.sparqnet.net
123.51.219.249	PTR	123-51-219-249.adsl.static.sparqnet.net
123.51.219.253	PTR	123-51-219-253.adsl.static.sparqnet.net
123.51.219.254	PTR	123-51-219-254.adsl.static.sparqnet.net