Robtex

Up: 61.145.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 61.145.76.0/23
Down right: 61.145.78.0/23

IP	Type	Hostname
61.145.76.27	PTR	27.76.145.61.broad.fs.gd.dynamic.163data.com.cn
61.145.77.22	PTR	22.77.145.61.broad.fs.gd.dynamic.163data.com.cn
61.145.77.48	PTR	48.77.145.61.broad.fs.gd.dynamic.163data.com.cn
61.145.78.6	PTR	6.78.145.61.broad.fs.gd.dynamic.163data.com.cn
61.145.79.141	PTR	141.79.145.61.broad.fs.gd.dynamic.163data.com.cn