Robtex

Up: 121.204.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 121.204.200.0/22
Down right: 121.204.204.0/22

IP	Type	Hostname
121.204.200.225	PTR	225.200.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.200.241	PTR	241.200.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.201.24	PTR	24.201.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.203.19	PTR	19.203.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.203.107	PTR	107.203.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.203.115	PTR	115.203.204.121.board.xm.fj.dynamic.163data.com.cn
121.204.203.206	A	hxny-china.com
121.204.205.33	PTR	33.205.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.205.171	PTR	171.205.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.205.187	PTR	187.205.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.205.211	PTR	211.205.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.206.27	PTR	27.206.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.206.84	PTR	84.206.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.206.102	PTR	102.206.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.206.116	PTR	116.206.204.121.broad.xm.fj.dynamic.163data.com.cn
121.204.207.51	PTR	51.207.204.121.board.xm.fj.dynamic.163data.com.cn