Robtex

Up: 115.75.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 115.75.5.0/25
Down right: 115.75.5.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
115.75.5.1	PTR	adsl.viettel.vn
115.75.5.1	A	arisee.com
115.75.5.2	PTR	adsl.viettel.vn
115.75.5.5	PTR	adsl.viettel.vn
115.75.5.8	PTR	adsl.viettel.vn
115.75.5.29	PTR	adsl.viettel.vn
115.75.5.42	PTR	adsl.viettel.vn
115.75.5.42	A	mail.bhxhtphcm.gov.vn
115.75.5.49	PTR	adsl.viettel.vn
115.75.5.61	PTR	adsl.viettel.vn
115.75.5.61	A	hcm2.pasl.com.vn
115.75.5.61	A	hcm2.amss.com.vn
115.75.5.67	A	bvnguyentriphuong.org
115.75.5.77	A	viettelsolution.com.vn
115.75.5.77	A	www.dinhviviettel.vn
115.75.5.77	A	www.viettelsolution.com.vn
115.75.5.84	PTR	adsl.viettel.vn
115.75.5.84	A	mail.cinebox.vn
115.75.5.95	PTR	adsl.viettel.vn
115.75.5.95	A	*.maycosmedic.com
115.75.5.95	A	bkmail.maycosmedic.com
115.75.5.105	PTR	adsl.viettel.vn
115.75.5.105	A	nittsu.com.vn
115.75.5.106	PTR	adsl.viettel.vn
115.75.5.108	A	www.kienvuong.com
115.75.5.108	A	kienbinhminh.com
115.75.5.109	PTR	adsl.viettel.vn
115.75.5.144	PTR	adsl.viettel.vn
115.75.5.152	PTR	adsl.viettel.vn
115.75.5.158	PTR	adsl.viettel.vn
115.75.5.206	PTR	adsl.viettel.vn
115.75.5.207	PTR	adsl.viettel.vn
115.75.5.242	PTR	adsl.viettel.vn