Robtex

Up: 27.67.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 27.67.0.0/18
Down right: 27.67.64.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.67.0.0	PTR	localhost
27.67.0.8	PTR	localhost
27.67.0.12	PTR	localhost
27.67.0.131	PTR	localhost
27.67.0.141	PTR	localhost
27.67.0.157	PTR	localhost
27.67.0.167	PTR	localhost
27.67.1.16	PTR	localhost
27.67.1.25	PTR	localhost
27.67.1.64	PTR	localhost
27.67.1.129	PTR	localhost
27.67.2.58	PTR	localhost
27.67.7.60	PTR	localhost
27.67.8.183	PTR	localhost
27.67.9.152	PTR	localhost
27.67.9.177	PTR	localhost
27.67.10.35	PTR	localhost
27.67.10.121	PTR	localhost
27.67.12.164	PTR	localhost
27.67.17.75	PTR	localhost
27.67.17.248	PTR	localhost
27.67.18.126	PTR	localhost
27.67.19.50	PTR	localhost
27.67.23.107	PTR	localhost
27.67.23.202	PTR	localhost
27.67.25.43	PTR	localhost
27.67.26.251	PTR	localhost
27.67.29.11	PTR	localhost
27.67.30.153	PTR	localhost
27.67.32.205	PTR	localhost
27.67.33.162	PTR	localhost
27.67.33.182	PTR	localhost
27.67.35.156	PTR	localhost
27.67.36.7	PTR	localhost
27.67.37.240	PTR	localhost
27.67.38.99	PTR	localhost
27.67.39.53	PTR	localhost
27.67.40.231	PTR	localhost
27.67.40.244	PTR	localhost
27.67.43.76	PTR	localhost
27.67.43.146	PTR	localhost
27.67.46.207	PTR	localhost
27.67.47.66	PTR	localhost
27.67.48.218	PTR	localhost
27.67.48.218	A	www.vietteltv.vn
27.67.48.218	A	vietteltv.vn
27.67.48.224	PTR	localhost
27.67.48.224	A	otttv.viettel.com.vn
27.67.49.232	PTR	localhost
27.67.49.232	A	ottad.viettel.com.vn
27.67.49.238	PTR	localhost
27.67.49.238	A	vietteltv.com.vn
27.67.50.70	PTR	localhost
27.67.64.74	PTR	localhost
27.67.64.105	PTR	localhost
27.67.80.97	PTR	localhost
27.67.80.100	PTR	localhost
27.67.101.33	PTR	localhost