Robtex

Up: 121.11.96.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.11.104.0/22
Down right: 121.11.108.0/22

IP	Type	Hostname
121.11.104.8	PTR	8.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.27	PTR	27.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.33	PTR	33.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.40	PTR	40.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.97	PTR	97.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.163	PTR	163.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.185	PTR	185.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.201	PTR	201.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.209	PTR	209.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.224	PTR	224.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.225	PTR	225.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.235	PTR	235.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.104.250	PTR	250.104.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.18	PTR	18.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.33	PTR	33.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.41	PTR	41.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.90	PTR	90.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.99	PTR	99.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.137	PTR	137.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.138	PTR	138.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.146	PTR	146.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.169	PTR	169.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.224	PTR	224.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.105.225	PTR	225.105.11.121.broad.st.gd.dynamic.163data.com.cn
121.11.111.140	A	osa.com