Robtex

Up: 203.113.130.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 203.113.131.0/25
Down right: 203.113.131.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.113.131.1	A+PTR	dns1.vietel.com.vn
203.113.131.1	A+PTR	dns1.viettel.com.vn
203.113.131.2	A+PTR	dns4.vietel.com.vn
203.113.131.2	A+PTR	dns4.viettel.com.vn
203.113.131.3	A+PTR	database.vietel.com.vn
203.113.131.3	A	cttvcoupling.com
203.113.131.4	A	billing.vietel.com.vn
203.113.131.9	A	web.vietel.com.vn
203.113.131.11	A+PTR	backup.viettel.com.vn
203.113.131.15	A+PTR	spamfilter.viettel.vn
203.113.131.16	A+PTR	mta-viettel-02.viettel.com.vn
203.113.131.16	A	smtp.vietel.com.vn
203.113.131.18	A	mailfilter-in.viettel.vn
203.113.131.23	A+PTR	incoming.viettel.com.vn
203.113.131.23	PTR	mailfilter-in-01.viettel.com.vn
203.113.131.23	A	incoming.vietel.com.vn
203.113.131.24	A+PTR	mailfilter-out-01.viettel.com.vn
203.113.131.25	A	pop3.vietel.com.vn
203.113.131.25	A	mail.sfcvietnam.vn
203.113.131.25	A	mail.sfcvietnam.com
203.113.131.26	A+PTR	mta-out-01.viettel.com.vn
203.113.131.26	PTR	smtp.viettel.com.vn
203.113.131.27	A+PTR	mta-in-01.viettel.com.vn
203.113.131.33	A+PTR	aaa.vietel.com.vn
203.113.131.34	PTR	mail.cswindtower.com
203.113.131.34	PTR	mail.fareastea.com
203.113.131.34	PTR	mail.isb-vietnam.com
203.113.131.35	A+PTR	ldap.vietel.com.vn
203.113.131.36	PTR	smtp.viettel.vn
203.113.131.37	A+PTR	billing.viettel.vn
203.113.131.49	PTR	178.vietel.com.vn
203.113.131.49	A	viettel.net.vn
203.113.131.49	A	vietteltelecom.com.vn
203.113.131.50	A	chat-ftp.vietel.com.vn
203.113.131.66	PTR	sps.viettel.vn
203.113.131.69	PTR	www.vra.gov.vn
203.113.131.69	A	web.sfcvietnam.com
203.113.131.69	A	zik.vietteltelecom.vn
203.113.131.72	A	web.viettel.com.vn
203.113.131.85	PTR	dns3.vietel.com.vn
203.113.131.99	A	admm.org.vn
203.113.131.112	A	ngoinhacuaban.com
203.113.131.112	A	garfield-cuncoi.com
203.113.131.123	A+PTR	observation.viettel.vn
203.113.131.124	PTR	adslfail.viettel.vn
203.113.131.140	PTR	huetronics.vn
203.113.131.145	A	external.fhan5-1.fna.fbcdn.net
203.113.131.145	A	scontent.fhan5-1.fna.fbcdn.net
203.113.131.146	A	video.fhan5-1.fna.fbcdn.net
203.113.131.158	A	z-m-scontent.fhan5-1.fna.fbcdn.net
203.113.131.158	A	sonar.fhan5-1.fna.fbcdn.net
203.113.131.158	A	z-1-video.fhan5-1.fna.fbcdn.net
203.113.131.160	A	instagram.fhan5-1.fna.fbcdn.net
203.113.131.161	A	media.fhan5-1.fna.whatsapp.net
203.113.131.162	A	z-p3-scontent.fhan5-1.fna.fbcdn.net
203.113.131.168	A	z-1-scontent.fhan5-1.fna.fbcdn.net
203.113.131.209	A	scontent.fhan5-2.fna.fbcdn.net
203.113.131.210	A	video.fhan5-2.fna.fbcdn.net
203.113.131.222	A	z-1-video.fhan5-2.fna.fbcdn.net
203.113.131.222	A	sonar.fhan5-2.fna.fbcdn.net
203.113.131.222	A	z-m-scontent.fhan5-2.fna.fbcdn.net
203.113.131.224	A	instagram.fhan5-2.fna.fbcdn.net
203.113.131.225	A	media.fhan5-2.fna.whatsapp.net
203.113.131.232	A	z-1-scontent.fhan5-2.fna.fbcdn.net