Robtex

Up: 123.185.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 123.185.16.0/21
Down right: 123.185.24.0/21

IP	Type	Hostname
123.185.16.243	PTR	243.16.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.17.113	PTR	113.17.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.17.130	PTR	130.17.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.18.125	A	ns1.tpddns.cn
123.185.20.81	PTR	81.20.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.20.112	PTR	112.20.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.20.177	PTR	177.20.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.20.243	PTR	243.20.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.21.2	PTR	2.21.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.21.50	PTR	50.21.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.21.177	PTR	177.21.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.21.225	PTR	225.21.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.21.226	PTR	226.21.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.22.32	PTR	32.22.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.22.99	PTR	99.22.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.22.147	PTR	147.22.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.23.32	PTR	32.23.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.23.34	PTR	34.23.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.23.112	PTR	112.23.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.23.129	PTR	129.23.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.24.176	PTR	176.24.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.26.241	PTR	241.26.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.26.241	A	teware.no-ip.biz
123.185.26.253	A	ddns.cnzhtour.com
123.185.28.130	PTR	130.28.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.30.128	PTR	128.30.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.30.211	PTR	211.30.185.123.broad.dl.ln.dynamic.163data.com.cn
123.185.31.16	PTR	16.31.185.123.broad.dl.ln.dynamic.163data.com.cn