Robtex

Up: 115.75.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 115.75.64.0/20
Down right: 115.75.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
115.75.65.1	PTR	adsl.viettel.vn
115.75.65.64	PTR	adsl.viettel.vn
115.75.65.128	PTR	adsl.viettel.vn
115.75.65.194	PTR	adsl.viettel.vn
115.75.66.192	PTR	adsl.viettel.vn
115.75.67.32	PTR	adsl.viettel.vn
115.75.67.96	PTR	adsl.viettel.vn
115.75.67.128	PTR	adsl.viettel.vn
115.75.67.193	PTR	adsl.viettel.vn
115.75.72.2	PTR	adsl.viettel.vn
115.75.72.33	PTR	adsl.viettel.vn
115.75.72.99	PTR	adsl.viettel.vn
115.75.72.130	PTR	adsl.viettel.vn
115.75.72.160	PTR	adsl.viettel.vn
115.75.73.175	A	thiepcuoitiengiang.com
115.75.73.175	A	mail.thiepcuoitiengiang.com
115.75.75.254	A	mail.toyotatiengiang.com.vn
115.75.78.152	PTR	adsl.viettel.vn
115.75.85.227	PTR	adsl.viettel.vn
115.75.88.90	A	daianhsang.com
115.75.88.224	A	mail.hanamicm.com
115.75.88.224	A	phuongnam.cloud
115.75.88.224	A	www.phuongnam.info
115.75.90.2	PTR	adsl.viettel.vn
115.75.91.61	A	atte.vn
115.75.91.64	PTR	adsl.viettel.vn
115.75.91.161	PTR	adsl.viettel.vn
115.75.91.177	A	smnuisam.drayddns.com