Robtex

Up: 123.51.162.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 123.51.163.0/25
Down right: 123.51.163.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.51.163.0	PTR	123-51-163-0.adsl.static.sparqnet.net
123.51.163.6	PTR	123-51-163-6.adsl.static.sparqnet.net
123.51.163.9	PTR	123-51-163-9.adsl.static.sparqnet.net
123.51.163.11	PTR	123-51-163-11.adsl.static.sparqnet.net
123.51.163.12	PTR	123-51-163-12.adsl.static.sparqnet.net
123.51.163.16	PTR	123-51-163-16.adsl.static.sparqnet.net
123.51.163.19	PTR	123-51-163-19.adsl.static.sparqnet.net
123.51.163.20	PTR	123-51-163-20.adsl.static.sparqnet.net
123.51.163.21	PTR	123-51-163-21.adsl.static.sparqnet.net
123.51.163.23	PTR	123-51-163-23.adsl.static.sparqnet.net
123.51.163.24	PTR	123-51-163-24.adsl.static.sparqnet.net
123.51.163.25	PTR	123-51-163-25.adsl.static.sparqnet.net
123.51.163.27	PTR	123-51-163-27.adsl.static.sparqnet.net
123.51.163.28	A	www.blueshield.com.tw
123.51.163.29	A	mail.rayang.com.cn
123.51.163.29	A	mail.blueshield.com.tw
123.51.163.29	A	rayang.com.cn
123.51.163.32	PTR	123-51-163-32.adsl.static.sparqnet.net
123.51.163.34	PTR	123-51-163-34.adsl.static.sparqnet.net
123.51.163.36	PTR	123-51-163-36.adsl.static.sparqnet.net
123.51.163.37	PTR	123-51-163-37.adsl.static.sparqnet.net
123.51.163.38	PTR	123-51-163-38.adsl.static.sparqnet.net
123.51.163.45	PTR	123-51-163-45.adsl.static.sparqnet.net
123.51.163.47	PTR	123-51-163-47.adsl.static.sparqnet.net
123.51.163.48	PTR	123-51-163-48.adsl.static.sparqnet.net
123.51.163.49	PTR	123-51-163-49.adsl.static.sparqnet.net
123.51.163.51	PTR	123-51-163-51.adsl.static.sparqnet.net
123.51.163.52	PTR	123-51-163-52.adsl.static.sparqnet.net
123.51.163.54	PTR	123-51-163-54.adsl.static.sparqnet.net
123.51.163.54	A	www.rayang.com.cn
123.51.163.55	PTR	123-51-163-55.adsl.static.sparqnet.net
123.51.163.56	PTR	123-51-163-56.adsl.static.sparqnet.net
123.51.163.58	PTR	123-51-163-58.adsl.static.sparqnet.net
123.51.163.60	PTR	123-51-163-60.adsl.static.sparqnet.net
123.51.163.61	PTR	123-51-163-61.adsl.static.sparqnet.net
123.51.163.62	PTR	123-51-163-62.adsl.static.sparqnet.net
123.51.163.64	PTR	123-51-163-64.adsl.static.sparqnet.net
123.51.163.68	PTR	123-51-163-68.adsl.static.sparqnet.net
123.51.163.70	PTR	123-51-163-70.adsl.static.sparqnet.net
123.51.163.71	PTR	123-51-163-71.adsl.static.sparqnet.net
123.51.163.72	PTR	123-51-163-72.adsl.static.sparqnet.net
123.51.163.73	PTR	123-51-163-73.adsl.static.sparqnet.net
123.51.163.76	PTR	123-51-163-76.adsl.static.sparqnet.net
123.51.163.83	PTR	123-51-163-83.adsl.static.sparqnet.net
123.51.163.84	PTR	123-51-163-84.adsl.static.sparqnet.net
123.51.163.85	PTR	123-51-163-85.adsl.static.sparqnet.net
123.51.163.88	PTR	123-51-163-88.adsl.static.sparqnet.net
123.51.163.89	PTR	123-51-163-89.adsl.static.sparqnet.net
123.51.163.90	PTR	123-51-163-90.adsl.static.sparqnet.net
123.51.163.91	PTR	123-51-163-91.adsl.static.sparqnet.net
123.51.163.93	PTR	123-51-163-93.adsl.static.sparqnet.net
123.51.163.96	PTR	123-51-163-96.adsl.static.sparqnet.net
123.51.163.97	PTR	123-51-163-97.adsl.static.sparqnet.net
123.51.163.107	PTR	123-51-163-107.adsl.static.sparqnet.net
123.51.163.109	PTR	123-51-163-109.adsl.static.sparqnet.net
123.51.163.112	PTR	123-51-163-112.adsl.static.sparqnet.net
123.51.163.115	PTR	123-51-163-115.adsl.static.sparqnet.net
123.51.163.116	PTR	123-51-163-116.adsl.static.sparqnet.net
123.51.163.116	A	dns.welldonelog.com
123.51.163.116	A	welldonelog.com
123.51.163.119	PTR	123-51-163-119.adsl.static.sparqnet.net
123.51.163.122	PTR	123-51-163-122.adsl.static.sparqnet.net
123.51.163.126	PTR	123-51-163-126.adsl.static.sparqnet.net
123.51.163.128	PTR	123-51-163-128.adsl.static.sparqnet.net
123.51.163.133	PTR	123-51-163-133.adsl.static.sparqnet.net
123.51.163.134	PTR	123-51-163-134.adsl.static.sparqnet.net
123.51.163.142	PTR	123-51-163-142.adsl.static.sparqnet.net
123.51.163.143	PTR	123-51-163-143.adsl.static.sparqnet.net
123.51.163.144	PTR	123-51-163-144.adsl.static.sparqnet.net
123.51.163.144	A	www.attackers.ir
123.51.163.144	A	superqin.com.tw
123.51.163.148	PTR	123-51-163-148.adsl.static.sparqnet.net
123.51.163.150	PTR	123-51-163-150.adsl.static.sparqnet.net
123.51.163.152	PTR	123-51-163-152.adsl.static.sparqnet.net
123.51.163.153	PTR	123-51-163-153.adsl.static.sparqnet.net
123.51.163.156	PTR	123-51-163-156.adsl.static.sparqnet.net
123.51.163.157	PTR	123-51-163-157.adsl.static.sparqnet.net
123.51.163.164	PTR	123-51-163-164.adsl.static.sparqnet.net
123.51.163.167	PTR	123-51-163-167.adsl.static.sparqnet.net
123.51.163.169	PTR	123-51-163-169.adsl.static.sparqnet.net
123.51.163.174	PTR	123-51-163-174.adsl.static.sparqnet.net
123.51.163.175	PTR	123-51-163-175.adsl.static.sparqnet.net
123.51.163.176	PTR	123-51-163-176.adsl.static.sparqnet.net
123.51.163.176	A	ms2.flytech.com.tw
123.51.163.179	PTR	123-51-163-179.adsl.static.sparqnet.net
123.51.163.186	PTR	123-51-163-186.adsl.static.sparqnet.net
123.51.163.188	PTR	123-51-163-188.adsl.static.sparqnet.net
123.51.163.190	PTR	123-51-163-190.adsl.static.sparqnet.net
123.51.163.191	PTR	123-51-163-191.adsl.static.sparqnet.net
123.51.163.196	PTR	123-51-163-196.adsl.static.sparqnet.net
123.51.163.200	PTR	123-51-163-200.adsl.static.sparqnet.net
123.51.163.201	PTR	123-51-163-201.adsl.static.sparqnet.net
123.51.163.205	PTR	123-51-163-205.adsl.static.sparqnet.net
123.51.163.206	PTR	123-51-163-206.adsl.static.sparqnet.net
123.51.163.209	PTR	123-51-163-209.adsl.static.sparqnet.net
123.51.163.214	PTR	123-51-163-214.adsl.static.sparqnet.net
123.51.163.216	PTR	123-51-163-216.adsl.static.sparqnet.net
123.51.163.218	PTR	123-51-163-218.adsl.static.sparqnet.net
123.51.163.223	PTR	123-51-163-223.adsl.static.sparqnet.net
123.51.163.229	PTR	123-51-163-229.adsl.static.sparqnet.net
123.51.163.230	PTR	123-51-163-230.adsl.static.sparqnet.net
123.51.163.231	PTR	123-51-163-231.adsl.static.sparqnet.net
123.51.163.233	PTR	123-51-163-233.adsl.static.sparqnet.net
123.51.163.236	PTR	123-51-163-236.adsl.static.sparqnet.net
123.51.163.240	PTR	123-51-163-240.adsl.static.sparqnet.net
123.51.163.241	PTR	123-51-163-241.adsl.static.sparqnet.net
123.51.163.244	PTR	123-51-163-244.adsl.static.sparqnet.net
123.51.163.248	PTR	123-51-163-248.adsl.static.sparqnet.net
123.51.163.252	PTR	123-51-163-252.adsl.static.sparqnet.net
123.51.163.255	PTR	123-51-163-255.adsl.static.sparqnet.net