Robtex

Up: 121.12.32.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 121.12.32.0/21
Down right: 121.12.40.0/21

IP	Type	Hostname
121.12.33.0	PTR	0.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.1	PTR	1.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.18	PTR	18.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.32	PTR	32.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.33	PTR	33.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.48	PTR	48.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.49	PTR	49.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.51	PTR	51.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.65	PTR	65.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.97	PTR	97.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.113	PTR	113.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.114	PTR	114.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.115	PTR	115.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.131	PTR	131.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.144	PTR	144.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.33.193	PTR	193.33.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.34.41	PTR	41.34.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.36.51	PTR	51.36.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.36.194	PTR	194.36.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.36.224	PTR	224.36.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.38.96	PTR	96.38.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.38.162	PTR	162.38.12.121.broad.jm.gd.dynamic.163data.com.cn
121.12.43.129	A	jmopd.com
121.12.46.1	A	yflc2011.com