Robtex

Up: 171.252.0.0/14
Can't show all results, try to descend to a more specific CIDR
Down left: 171.254.0.0/16
Down right: 171.255.0.0/16
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
171.254.1.117	A	isqdc.com
171.254.3.85	PTR	dynamic-adsl.viettel.vn
171.254.10.74	PTR	dynamic-ip-adsl.viettel.vn
171.254.10.214	A	mail.thaibinhtpc.com
171.254.10.214	A	thaibinhtpc.com
171.254.11.241	A	sinhvien.hpmu.edu.vn
171.254.28.27	A	test-java.com
171.254.30.129	PTR	dynamic-ip-adsl.viettel.vn
171.254.65.163	PTR	dynamic-ip-adsl.viettel.vn
171.254.76.54	PTR	dynamic-adsl.viettel.vn
171.254.76.54	A	danglh.ddns.net
171.254.131.246	PTR	dynamic-ip-adsl.viettel.vn
171.254.146.218	PTR	dynamic-ip-adsl.viettel.vn
171.254.227.12	PTR	dynamic-ip-adsl.viettel.vn
171.255.64.54	PTR	dynamic-ip-adsl.viettel.vn
171.255.64.74	PTR	dynamic-ip-adsl.viettel.vn
171.255.65.6	PTR	dynamic-ip-adsl.viettel.vn
171.255.71.73	PTR	dynamic-ip-adsl.viettel.vn
171.255.71.89	PTR	dynamic-ip-adsl.viettel.vn
171.255.77.239	PTR	dynamic-ip-adsl.viettel.vn
171.255.78.233	PTR	dynamic-adsl.viettel.vn
171.255.117.252	PTR	dynamic-ip-adsl.viettel.vn
171.255.121.23	PTR	dynamic-ip-adsl.viettel.vn
171.255.122.206	PTR	dynamic-ip-adsl.viettel.vn
171.255.128.155	PTR	dynamic-adsl.viettel.vn
171.255.131.155	PTR	dynamic-ip-adsl.viettel.vn
171.255.145.242	PTR	dynamic-ip-adsl.viettel.vn
171.255.192.4	A	phapluat.netnews.vn
171.255.192.16	PTR	dynamic-ip-adsl.viettel.vn
171.255.192.16	A	qlvb.thainguyen.edu.vn
171.255.192.16	A	edu.vpdt.com.vn
171.255.192.23	PTR	dynamic-ip-adsl.viettel.vn
171.255.194.10	PTR	dynamic-ip-adsl.viettel.vn
171.255.194.10	A	mykid.viettel.vn
171.255.196.65	PTR	dynamic-ip-adsl.viettel.vn
171.255.196.65	A	cdn.ereka.vn
171.255.196.69	PTR	dynamic-ip-adsl.viettel.vn
171.255.196.69	A	ns1.ereka.vn
171.255.196.70	PTR	dynamic-ip-adsl.viettel.vn
171.255.196.70	A	ns2.ereka.vn
171.255.196.169	A	itrithuc.vn
171.255.196.177	A	cdn.ereka.vn
171.255.198.17	A	scontent.fhan5-3.fna.fbcdn.net
171.255.198.18	PTR	dynamic-adsl.viettel.vn
171.255.198.18	A	video.fhan5-3.fna.fbcdn.net
171.255.198.30	A	sonar.fhan5-3.fna.fbcdn.net
171.255.198.30	A	z-m-scontent.fhan5-3.fna.fbcdn.net
171.255.199.140	A	cdn.ereka.vn
171.255.200.12	A	r1.sn-8pxuuxa-i5oll.gvt1.com
171.255.200.12	A	r1.sn-8pxuuxa-i5oll.googlevideo.com
171.255.200.13	A	r2.sn-8pxuuxa-i5oll.gvt1.com
171.255.200.13	A	r2.sn-8pxuuxa-i5oll.googlevideo.com
171.255.202.12	A	r1.sn-8pxuuxa-i5oss.gvt1.com
171.255.202.12	A	r1.sn-8pxuuxa-i5oss.googlevideo.com
171.255.202.13	A	r2.sn-8pxuuxa-i5oss.googlevideo.com
171.255.202.13	A	r2.sn-8pxuuxa-i5oss.gvt1.com
171.255.204.12	A	r1.sn-8pxuuxa-0pie.gvt1.com
171.255.204.12	A	r1.sn-8pxuuxa-0pie.googlevideo.com
171.255.204.13	PTR	dynamic-ip-adsl.viettel.vn
171.255.204.13	A	r2.sn-8pxuuxa-0pie.googlevideo.com
171.255.204.13	A	r2.sn-8pxuuxa-0pie.gvt1.com
171.255.204.14	PTR	dynamic-ip-adsl.viettel.vn
171.255.206.44	PTR	dynamic-ip-adsl.viettel.vn
171.255.206.44	A	r1.sn-8pxuuxa-nbosr.gvt1.com
171.255.206.47	PTR	dynamic-adsl.viettel.vn
171.255.206.47	A	r4.sn-8pxuuxa-nbosr.gvt1.com
171.255.206.49	PTR	dynamic-ip-adsl.viettel.vn
171.255.206.49	A	r6.sn-8pxuuxa-nbosr.gvt1.com
171.255.206.50	A	r7.sn-8pxuuxa-nbosr.googlevideo.com
171.255.221.26	PTR	dynamic-ip-adsl.viettel.vn
171.255.229.237	PTR	dynamic-ip-adsl.viettel.vn