Robtex

Up: 117.0.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 117.0.28.0/23
Down right: 117.0.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
117.0.28.2	PTR	localhost
117.0.28.7	PTR	localhost
117.0.28.11	PTR	localhost
117.0.28.21	PTR	localhost
117.0.28.23	PTR	localhost
117.0.28.24	PTR	localhost
117.0.28.29	PTR	localhost
117.0.28.38	PTR	localhost
117.0.28.43	PTR	localhost
117.0.28.51	PTR	localhost
117.0.28.52	PTR	localhost
117.0.28.59	PTR	localhost
117.0.28.85	PTR	localhost
117.0.28.97	PTR	localhost
117.0.28.99	PTR	localhost
117.0.28.102	PTR	localhost
117.0.28.103	PTR	localhost
117.0.28.109	PTR	localhost
117.0.28.112	PTR	localhost
117.0.28.120	PTR	localhost
117.0.28.121	PTR	localhost
117.0.28.127	PTR	localhost
117.0.28.135	PTR	localhost
117.0.28.140	PTR	localhost
117.0.28.142	PTR	localhost
117.0.28.157	PTR	localhost
117.0.28.160	PTR	localhost
117.0.28.165	PTR	localhost
117.0.28.169	PTR	localhost
117.0.28.171	PTR	localhost
117.0.28.185	PTR	localhost
117.0.28.189	PTR	localhost
117.0.28.190	PTR	localhost
117.0.28.193	PTR	localhost
117.0.28.194	PTR	localhost
117.0.28.197	PTR	localhost
117.0.28.198	PTR	localhost
117.0.28.199	PTR	localhost
117.0.28.201	PTR	localhost
117.0.28.203	PTR	localhost
117.0.28.209	PTR	localhost
117.0.28.210	PTR	localhost
117.0.28.214	PTR	localhost
117.0.28.219	PTR	localhost
117.0.28.222	PTR	localhost
117.0.28.229	PTR	localhost
117.0.28.233	PTR	localhost
117.0.28.236	PTR	localhost
117.0.28.240	PTR	localhost
117.0.28.251	PTR	localhost
117.0.29.151	PTR	localhost
117.0.29.152	PTR	localhost
117.0.29.158	PTR	localhost
117.0.29.158	A	mail.khangminhauto.vn
117.0.29.158	A	khangminhauto.ddns.net
117.0.29.236	PTR	localhost
117.0.30.2	PTR	localhost
117.0.30.52	PTR	localhost
117.0.31.224	PTR	localhost