Robtex

Up: 117.4.176.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 117.4.180.0/23
Down right: 117.4.182.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
117.4.180.5	PTR	localhost
117.4.180.24	PTR	localhost
117.4.180.26	PTR	localhost
117.4.180.33	PTR	localhost
117.4.180.40	PTR	localhost
117.4.180.43	PTR	localhost
117.4.180.44	PTR	localhost
117.4.180.52	PTR	localhost
117.4.180.59	PTR	localhost
117.4.180.76	PTR	localhost
117.4.180.90	PTR	localhost
117.4.180.95	PTR	localhost
117.4.180.97	PTR	localhost
117.4.180.106	PTR	localhost
117.4.180.112	PTR	localhost
117.4.180.113	PTR	localhost
117.4.180.121	PTR	localhost
117.4.180.125	PTR	localhost
117.4.180.149	PTR	localhost
117.4.180.206	PTR	localhost
117.4.180.210	PTR	localhost
117.4.180.216	PTR	localhost
117.4.180.231	PTR	localhost
117.4.180.248	PTR	localhost
117.4.180.252	PTR	localhost
117.4.181.64	PTR	localhost
117.4.181.129	PTR	localhost
117.4.181.199	PTR	localhost
117.4.182.64	PTR	localhost
117.4.182.83	PTR	localhost
117.4.182.83	A	thaibinhtourism.com.vn
117.4.182.83	A	cdvhntthaibinh.edu.vn
117.4.182.152	PTR	localhost
117.4.182.252	PTR	localhost
117.4.183.2	PTR	localhost