Robtex

Up: 121.204.208.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.204.208.0/22
Down right: 121.204.212.0/22

IP	Type	Hostname
121.204.209.0	PTR	0.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.33	PTR	33.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.41	PTR	41.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.49	PTR	49.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.56	PTR	56.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.57	PTR	57.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.58	PTR	58.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.72	PTR	72.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.99	PTR	99.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.131	PTR	131.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.154	PTR	154.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.155	PTR	155.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.162	PTR	162.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.163	PTR	163.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.200	PTR	200.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.211	PTR	211.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.218	PTR	218.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.209.233	PTR	233.209.204.121.board.xm.fj.dynamic.163data.com.cn
121.204.209.235	PTR	235.209.204.121.board.xm.fj.dynamic.163data.com.cn
121.204.209.249	PTR	249.209.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.210.159	PTR	159.210.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.211.50	PTR	50.211.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.211.203	PTR	203.211.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.212.12	A	waterworld6.com
121.204.213.83	A	www.361-kids.com
121.204.214.148	PTR	148.214.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.215.240	PTR	240.215.204.121.broad.xm.fj.dynamic.163data.com.cn