Robtex

Up: 117.6.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 117.6.64.0/23
Down right: 117.6.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
117.6.64.15	A	vn.cwtoys.com
117.6.64.16	PTR	mail.vincomsc.com.vn
117.6.64.22	A	taikhoan.biz
117.6.64.127	PTR	mail.psi.org.vn
117.6.64.127	A	psi.org.vn
117.6.64.129	PTR	igsvn.ac.vn
117.6.64.137	A	loupx.com
117.6.64.137	A	dreamcatcherclub.org
117.6.64.137	A	wecheck.in
117.6.64.174	PTR	mail.zodiac.com.vn
117.6.64.179	PTR	mail.cnvgroup.com.vn
117.6.64.196	A	mail.uhyvietnam.com.vn
117.6.64.202	PTR	mail.thaihai.vn
117.6.65.208	PTR	mail.pvfi.com.vn