Robtex

Up: 125.234.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 125.234.20.0/23
Down right: 125.234.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
125.234.20.54	A	tiepthiso.net
125.234.20.54	A	mail.tiepthiso.net
125.234.20.70	PTR	125.234.20.70.hcm.viettel.vn
125.234.20.70	A	vitri.tk
125.234.20.170	PTR	mail.khangthong.vn
125.234.20.170	A	mta.khangthong.net
125.234.20.170	A	mx1.khangthong.net
125.234.20.242	PTR	125.234.20.242.hcm.viettel.vn
125.234.21.130	A	ns2.enetserver.com
125.234.21.210	A+PTR	mail.primevn.com
125.234.21.210	A	mail.dinhvietco.com
125.234.21.210	A	smtp.primevn.com
125.234.22.90	PTR	125.234.22.90.hcm.viettel.vn
125.234.22.210	PTR	125.234.22.210.hcm.viettel.vn
125.234.23.38	A	hungvuong.vn
125.234.23.38	A	mail.hungvuong.vn
125.234.23.50	PTR	125.234.23.50.hcm.viettel.vn
125.234.23.130	A	vina-anhlinh.com
125.234.23.130	A	mailbk.primevn.com
125.234.23.158	PTR	mail.thuychung.vn