Robtex

Up: 117.2.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 117.2.80.0/22
Down right: 117.2.84.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
117.2.80.1	PTR	localhost
117.2.80.8	PTR	localhost
117.2.80.25	PTR	localhost
117.2.80.26	PTR	localhost
117.2.80.41	PTR	localhost
117.2.80.42	PTR	localhost
117.2.80.51	PTR	localhost
117.2.80.64	PTR	localhost
117.2.80.81	PTR	localhost
117.2.80.90	PTR	localhost
117.2.80.96	PTR	localhost
117.2.80.104	PTR	localhost
117.2.80.107	PTR	localhost
117.2.80.112	PTR	localhost
117.2.80.114	PTR	localhost
117.2.80.120	PTR	localhost
117.2.80.137	PTR	localhost
117.2.80.139	PTR	localhost
117.2.80.169	PTR	localhost
117.2.80.177	PTR	localhost
117.2.80.178	PTR	localhost
117.2.80.186	PTR	localhost
117.2.80.195	PTR	localhost
117.2.80.226	PTR	localhost
117.2.80.233	PTR	localhost
117.2.80.242	PTR	localhost
117.2.80.249	PTR	localhost
117.2.81.195	PTR	localhost
117.2.82.56	PTR	localhost
117.2.82.68	A	www.htbio.com.vn
117.2.82.68	A	truongchinhtrilamdong.com.vn
117.2.82.68	A	langbiang.gov.vn
117.2.82.72	PTR	localhost
117.2.82.129	PTR	localhost
117.2.82.139	PTR	localhost
117.2.82.178	PTR	localhost
117.2.82.179	PTR	localhost
117.2.82.208	PTR	localhost
117.2.82.232	PTR	localhost
117.2.84.143	PTR	localhost
117.2.85.129	PTR	localhost
117.2.85.136	PTR	localhost
117.2.85.208	PTR	localhost
117.2.85.211	PTR	localhost
117.2.85.217	PTR	localhost
117.2.86.2	PTR	localhost
117.2.86.40	PTR	localhost
117.2.86.41	PTR	localhost
117.2.86.56	PTR	localhost
117.2.86.65	PTR	localhost
117.2.86.81	PTR	localhost
117.2.86.106	PTR	localhost
117.2.86.112	PTR	localhost
117.2.86.146	PTR	localhost
117.2.86.153	PTR	localhost
117.2.86.179	PTR	localhost
117.2.86.185	PTR	localhost
117.2.86.195	PTR	localhost
117.2.86.218	PTR	localhost
117.2.86.224	PTR	localhost