Robtex

Up: 117.4.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 117.4.12.0/23
Down right: 117.4.14.0/23

IP	Type	Hostname
117.4.12.18	PTR	localhost
117.4.12.58	PTR	localhost
117.4.12.68	PTR	localhost
117.4.12.87	PTR	localhost
117.4.12.89	PTR	localhost
117.4.12.107	PTR	localhost
117.4.12.124	PTR	localhost
117.4.12.133	PTR	localhost
117.4.12.136	PTR	localhost
117.4.12.153	PTR	localhost
117.4.12.163	PTR	localhost
117.4.12.165	PTR	localhost
117.4.12.175	PTR	localhost
117.4.12.208	PTR	localhost
117.4.12.222	PTR	localhost
117.4.12.251	PTR	localhost
117.4.13.18	PTR	localhost
117.4.13.54	PTR	localhost
117.4.13.66	PTR	localhost
117.4.13.68	PTR	localhost
117.4.13.76	PTR	localhost
117.4.13.83	PTR	localhost
117.4.13.90	PTR	localhost
117.4.13.93	PTR	localhost
117.4.13.100	PTR	localhost
117.4.13.112	PTR	localhost
117.4.13.113	PTR	localhost
117.4.13.117	PTR	localhost
117.4.13.127	PTR	localhost
117.4.13.132	PTR	localhost
117.4.13.133	PTR	localhost
117.4.13.145	PTR	localhost
117.4.13.155	PTR	localhost
117.4.13.158	PTR	localhost
117.4.13.169	PTR	localhost
117.4.13.180	PTR	localhost
117.4.13.194	PTR	localhost
117.4.13.227	PTR	localhost
117.4.13.232	PTR	localhost
117.4.13.254	PTR	localhost
117.4.15.2	PTR	localhost
117.4.15.47	PTR	localhost
117.4.15.124	PTR	localhost
117.4.15.125	PTR	localhost
117.4.15.126	PTR	localhost
117.4.15.135	PTR	localhost