Robtex

Up: 123.30.192.0/18
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Down left: 123.30.192.0/20
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(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.30.192.2	PTR	static.vdc.vn
123.30.192.3	PTR	static.vdc.vn
123.30.192.32	PTR	static.vnpt.vn
123.30.192.33	PTR	static.vdc.vn
123.30.192.34	PTR	static.vdc.vn
123.30.192.35	PTR	static.vdc.vn
123.30.192.65	PTR	static.vnpt.vn
123.30.192.67	PTR	static.vnpt.vn
123.30.192.98	PTR	static.vdc.vn
123.30.192.128	PTR	static.vdc.vn
123.30.192.129	PTR	static.vdc.vn
123.30.192.160	PTR	static.vdc.vn
123.30.192.161	PTR	static.vdc.vn
123.30.192.162	PTR	static.vdc.vn
123.30.192.192	PTR	static.vdc.vn
123.30.192.193	PTR	static.vdc.vn
123.30.192.194	PTR	static.vdc.vn
123.30.192.195	PTR	static.vdc.vn
123.30.192.224	PTR	static.vnpt.vn
123.30.192.225	PTR	static.vdc.vn
123.30.192.226	PTR	static.vdc.vn
123.30.192.227	PTR	static.vdc.vn
123.30.193.0	PTR	static.vdc.vn
123.30.193.1	PTR	static.vdc.vn
123.30.193.3	PTR	static.vdc.vn
123.30.193.32	PTR	static.vdc.vn
123.30.193.34	PTR	static.vdc.vn
123.30.193.35	PTR	static.vdc.vn
123.30.193.64	PTR	static.vdc.vn
123.30.193.65	PTR	static.vdc.vn
123.30.193.66	PTR	static.vdc.vn
123.30.193.67	PTR	static.vdc.vn
123.30.193.96	PTR	static.vdc.vn
123.30.193.98	PTR	static.vdc.vn
123.30.193.99	PTR	static.vdc.vn
123.30.193.99	A	clipcuatoi.net
123.30.193.99	A	www.mbongda.com.vn
123.30.193.100	A	www.mhdviet.vn
123.30.193.129	PTR	static.vdc.vn
123.30.193.130	PTR	static.vdc.vn
123.30.193.160	PTR	static.vdc.vn
123.30.193.161	PTR	static.vdc.vn
123.30.193.162	PTR	static.vdc.vn
123.30.193.194	PTR	static.vdc.vn
123.30.193.195	PTR	static.vdc.vn
123.30.193.224	PTR	static.vdc.vn
123.30.193.225	PTR	static.vdc.vn
123.30.193.226	PTR	static.vdc.vn
123.30.193.227	PTR	static.vdc.vn
123.30.200.1	PTR	dynamic.vdc.vn
123.30.200.2	PTR	dynamic.vdc.vn
123.30.200.3	PTR	dynamic.vdc.vn
123.30.200.42	A	mail.ongame.vn
123.30.200.50	A	mail.ongame.vn
123.30.200.60	A	mail.net2e.vn
123.30.200.60	A	mx.net2e.vn
123.30.200.60	A	mail.vdc-net2e.vn
123.30.200.64	PTR	static.vnpt.vn
123.30.200.65	PTR	dynamic.vdc.vn
123.30.200.66	PTR	dynamic.vdc.vn
123.30.200.67	A	logo.conduongtolua.com.vn
123.30.200.70	A	test.conduongtolua.com.vn
123.30.200.75	A	vdc-net2e.vn
123.30.200.75	A	net2e.vn
123.30.200.96	PTR	dynamic.vdc.vn
123.30.200.98	PTR	dynamic.vdc.vn
123.30.200.99	PTR	dynamic.vdc.vn
123.30.200.107	A	conduongtolua.com.vn
123.30.200.107	A	cdtl.ongame.vn
123.30.200.107	A	dichvu.cdtl.ongame.vn
123.30.200.128	PTR	dynamic.vdc.vn
123.30.200.129	PTR	dynamic.vdc.vn
123.30.200.130	PTR	dynamic.vdc.vn
123.30.200.131	PTR	dynamic.vdc.vn
123.30.200.131	A	ongame.com.vn
123.30.200.131	A	storage.ongame.vn
123.30.200.160	A	new-admin.ongame.vn
123.30.200.161	PTR	dynamic.vdc.vn
123.30.200.163	PTR	dynamic.vdc.vn
123.30.200.186	A	f1newsleader.info
123.30.200.187	A	avi-industry.com
123.30.200.187	A	*.sieuthinongsan.net
123.30.200.190	A	cdtl.ongame.vn
123.30.200.192	PTR	dynamic.vdc.vn
123.30.200.194	A	identity.ongame.vn
123.30.200.197	A	web-api.ongame.vn
123.30.200.224	PTR	dynamic.vdc.vn
123.30.200.225	PTR	dynamic.vdc.vn
123.30.200.226	PTR	dynamic.vdc.vn
123.30.200.227	PTR	dynamic.vdc.vn
123.30.201.1	PTR	dynamic.vdc.vn
123.30.201.2	PTR	dynamic.vdc.vn
123.30.201.3	PTR	dynamic.vdc.vn
123.30.201.32	PTR	dynamic.vdc.vn
123.30.201.33	PTR	dynamic.vdc.vn
123.30.201.34	PTR	dynamic.vdc.vn
123.30.201.64	PTR	dynamic.vdc.vn
123.30.201.65	PTR	dynamic.vnpt.vn
123.30.201.66	PTR	dynamic.vdc.vn
123.30.201.67	PTR	dynamic.vdc.vn
123.30.201.96	PTR	dynamic.vdc.vn
123.30.201.97	PTR	dynamic.vdc.vn
123.30.201.128	PTR	dynamic.vdc.vn
123.30.201.161	PTR	dynamic.vdc.vn
123.30.201.162	PTR	dynamic.vdc.vn
123.30.201.192	PTR	dynamic.vdc.vn
123.30.201.193	PTR	dynamic.vdc.vn
123.30.201.194	PTR	dynamic.vdc.vn
123.30.201.225	PTR	dynamic.vdc.vn
123.30.202.99	PTR	dynamic.vnpt.vn
123.30.203.96	PTR	dynamic.vnpt.vn
123.30.206.54	A	toanphatmobile.com.vn
123.30.208.1	PTR	static.vdc.vn
123.30.208.2	PTR	static.vdc.vn
123.30.208.3	PTR	static.vdc.vn
123.30.208.7	A	mail.transmeco.com
123.30.208.7	A	mail.deltavietnam.com.vn
123.30.208.7	A	*.deltavietnam.com.vn
123.30.208.32	PTR	static.vdc.vn
123.30.208.33	PTR	static.vdc.vn
123.30.208.34	PTR	static.vdc.vn
123.30.208.35	PTR	static.vdc.vn
123.30.208.37	A	www.thethao24.tv
123.30.208.38	A	vtvplay.vn
123.30.208.38	A	eclip.vn
123.30.208.38	A	xom24.com
123.30.208.64	PTR	static.vdc.vn
123.30.208.66	PTR	static.vdc.vn
123.30.208.66	A	intelglobal.net
123.30.208.67	PTR	static.vdc.vn
123.30.208.68	A	designgroup.vietnamnay.com
123.30.208.68	A	*.hpmc.com.vn
123.30.208.68	A	satthepsaigon.net
123.30.208.96	PTR	static.vdc.vn
123.30.208.97	PTR	static.vdc.vn
123.30.208.97	A	forum.aoeviet.vn
123.30.208.97	A	getmanco.com
123.30.208.98	PTR	static.vdc.vn
123.30.208.100	A	www.ckca.vn
123.30.208.100	A	*.dot.net.vn
123.30.208.128	PTR	static.vdc.vn
123.30.208.129	PTR	static.vdc.vn
123.30.208.147	A	5play.mobi
123.30.208.157	A	vanphongre.com
123.30.208.157	A	benhvienphusanhanoi.vn
123.30.208.159	A	vnlive.38camhoi.com
123.30.208.161	PTR	lucky.cassistant.net
123.30.208.162	PTR	iscomfort.net
123.30.208.165	A	alt2.aspmx.l.google.com.timeoutvietnam.com
123.30.208.166	A	ams.com.vn
123.30.208.166	A	8x45.com.vn
123.30.208.166	A	ams.net.vn
123.30.208.192	PTR	static.vdc.vn
123.30.208.193	PTR	static.vdc.vn
123.30.208.194	PTR	static.vdc.vn
123.30.208.195	PTR	mail.net2e.vn
123.30.208.195	PTR	mail.vdc-net2e.vn
123.30.208.195	A	www.tuyengiao.vn
123.30.208.200	A	mx2.net2e.vn
123.30.208.200	A	mail.tuyengiao.vn
123.30.208.200	A	mx2.vdc-net2e.vn
123.30.208.224	PTR	static.vdc.vn
123.30.208.226	A	doanhnhantrevietnam.com
123.30.208.226	A	mail.doanhnhantrevietnam.com
123.30.208.226	A	mx.may-bay.com
123.30.209.0	PTR	static.vdc.vn
123.30.209.1	PTR	static.vdc.vn
123.30.209.2	PTR	static.vdc.vn
123.30.209.3	PTR	static.vdc.vn
123.30.209.4	A	kientruca1.vn
123.30.209.10	A	emk.bkns.com.vn
123.30.209.10	A	mail.bkns.com.vn
123.30.209.11	A	denledsieusang.biz
123.30.209.32	PTR	static.vdc.vn
123.30.209.32	A	tinhocthiennam.com
123.30.209.32	A	www.traidecuchi.com
123.30.209.33	PTR	static.vdc.vn
123.30.209.34	PTR	mx20934.hnvietnam.vn
123.30.209.35	PTR	static.vdc.vn
123.30.209.64	PTR	static.vnpt.vn
123.30.209.64	A	ns1.bkns.vn
123.30.209.65	PTR	static.vdc.vn
123.30.209.65	A	tuvanvinafirst.com
123.30.209.65	A	phunuhadong.com
123.30.209.66	PTR	static.vdc.vn
123.30.209.67	PTR	static.vdc.vn
123.30.209.96	PTR	static.vdc.vn
123.30.209.96	A	jerry.euro.sunnybeach.com.vn
123.30.209.96	A	bos-ns1.bos.sunnybeach.com.vn
123.30.209.97	PTR	static.vnpt.vn
123.30.209.98	PTR	static.vdc.vn
123.30.209.99	PTR	static.vdc.vn
123.30.209.128	PTR	static.vdc.vn
123.30.209.128	A	mail.bkns.biz
123.30.209.129	A	platinfashion.com
123.30.209.129	A	mail.vinpearlnails.com
123.30.209.130	PTR	static.vdc.vn
123.30.209.131	PTR	static.vdc.vn
123.30.209.131	A	www.trietlongvinhvien.net
123.30.209.160	PTR	static.vdc.vn
123.30.209.160	A	vuashop.vn
123.30.209.160	A	www.vuashop.vn
123.30.209.161	PTR	static.vdc.vn
123.30.209.161	A	thuoc-gia-truyen.com
123.30.209.161	A	thaomocsekhitcobe.com
123.30.209.162	PTR	static.vdc.vn
123.30.209.163	PTR	static.vdc.vn
123.30.209.192	PTR	static.vdc.vn
123.30.209.193	PTR	static.vdc.vn
123.30.209.193	A	mail.web5s.com
123.30.209.193	A	stefanni.com
123.30.209.194	PTR	static.vdc.vn
123.30.209.195	PTR	static.vdc.vn
123.30.209.224	PTR	static.vdc.vn
123.30.209.224	A	mail.ngoctranchau.com
123.30.209.224	A	*.tienvietnam.vn
123.30.209.226	PTR	static.vnpt.vn
123.30.209.227	PTR	static.vdc.vn
123.30.210.0	A	epcocbetong.org
123.30.210.2	PTR	everyconcept.com
123.30.210.2	A	mobile.tinmoi24.vn
123.30.210.2	A	www.tinmoi24.vn
123.30.210.32	PTR	static.vdc.vn
123.30.210.32	A	ns2.datacloud.vn
123.30.210.33	PTR	static.vdc.vn
123.30.210.33	A	datacloud.vn
123.30.210.34	PTR	static.vdc.vn
123.30.210.35	PTR	mail.datalink.com.vn
123.30.210.35	A	mail.giaitribachviet.com
123.30.210.35	A	mail.datacloud.vn
123.30.210.64	PTR	static.vdc.vn
123.30.210.65	PTR	static.vdc.vn
123.30.210.66	PTR	static.vdc.vn
123.30.210.67	PTR	static.vdc.vn
123.30.210.70	A	*.thienma.vn
123.30.210.70	A	ns4.thienma.vn
123.30.210.70	A	webpress.vn
123.30.210.74	A	longloan.vn
123.30.210.96	PTR	static.vdc.vn
123.30.210.97	PTR	static.vdc.vn
123.30.210.98	PTR	static.vdc.vn
123.30.210.99	PTR	static.vdc.vn
123.30.210.99	A	audio.muvik.tv
123.30.210.99	A	download.muvik.tv
123.30.210.117	A	canhotokyquan12.com
123.30.210.128	PTR	static.vdc.vn
123.30.210.129	PTR	static.vdc.vn
123.30.210.130	PTR	static.vdc.vn
123.30.210.131	PTR	static.vdc.vn
123.30.210.131	A	editor.vtc.vn
123.30.210.131	A	farm.vtc.vn
123.30.210.134	A	193-137-12-86.static.vtc.vn
123.30.210.134	A	2945.static.vtc.vn
123.30.210.161	PTR	static.vdc.vn
123.30.210.161	A	vtop.vn
123.30.210.162	PTR	static.vdc.vn
123.30.210.163	PTR	static.vdc.vn
123.30.210.163	A	hanoizestyhotel.com
123.30.210.163	A	bhxhhoabinh.gov.vn
123.30.210.193	PTR	static.vdc.vn
123.30.210.194	PTR	static.vdc.vn
123.30.210.195	A	theodoiquangcao.com
123.30.210.196	A	kaman-china.com
123.30.210.200	A	static-main.basecdn.net
123.30.210.200	A	data-main.basecdn.net
123.30.210.224	PTR	static.vdc.vn
123.30.210.224	A	s1.thuviengiaoan.com
123.30.210.224	A	thuviengiaoan.com
123.30.210.225	PTR	static.vdc.vn
123.30.211.0	PTR	static.vdc.vn
123.30.211.1	PTR	static.vdc.vn
123.30.211.2	PTR	static.vdc.vn
123.30.211.4	A	chodangxa.com
123.30.211.4	A	homevic.com.vn
123.30.211.4	A	duanlaluna.net
123.30.211.33	PTR	static.vdc.vn
123.30.211.34	PTR	static.vdc.vn
123.30.211.35	PTR	static.vdc.vn
123.30.211.36	A	ndcraft.com
123.30.211.36	A	mail.ruoungahaikimson.com
123.30.211.39	A	nangluongvietnam.vn
123.30.211.39	A	www.nangluongvietnam.vn
123.30.211.64	PTR	static.vdc.vn
123.30.211.65	PTR	static.vdc.vn
123.30.211.66	PTR	static.vdc.vn
123.30.211.68	A	bigwinonline.net
123.30.211.69	A	dietthan.com
123.30.211.69	A	ditinh.vn
123.30.211.76	A	minhngocxs.com
123.30.211.96	PTR	static.vdc.vn
123.30.211.96	A	namlim.com
123.30.211.96	A	mail.namlim.com
123.30.211.97	PTR	static.vdc.vn
123.30.211.98	PTR	static.vdc.vn
123.30.211.99	PTR	static.vdc.vn
123.30.211.100	A	mail.datviettv.vn
123.30.211.101	A	datviettv.vn
123.30.211.128	PTR	static.vdc.vn
123.30.211.129	PTR	static.vdc.vn
123.30.211.130	PTR	static.vdc.vn
123.30.211.131	PTR	static.vdc.vn
123.30.211.139	A	api.5play.mobi
123.30.211.141	A	mail.laodong-vieclam.com
123.30.211.144	A	audio.muvik.tv
123.30.211.144	A	download.muvik.tv
123.30.211.144	A	avatar.muvik.tv
123.30.211.160	PTR	static.vdc.vn
123.30.211.160	A	www.maychamcong-abv.com
123.30.211.160	A	abrivision.com.sg
123.30.211.162	PTR	static.vdc.vn
123.30.211.173	A	ns1.tenten.vn.katami.org
123.30.211.192	PTR	static.vdc.vn
123.30.211.194	PTR	static.vdc.vn
123.30.211.195	PTR	static.vdc.vn
123.30.211.195	A	www.certsapps.com
123.30.211.195	A	xe247.com.vn
123.30.211.196	A	navifilm.net
123.30.211.196	A	www.mobiphim.vn
123.30.211.226	PTR	static.vdc.vn
123.30.211.227	PTR	static.vdc.vn
123.30.211.231	A	mail.khoanhkhacvietnam.vn
123.30.211.241	A	langvuichoi.com
123.30.211.242	A	mx.khaitruong.net
123.30.211.242	A	onevip.net
123.30.212.5	A	x.sopcast.mobi
123.30.212.6	A	beta.sopcast.mobi
123.30.212.6	A	sopcast.mobi
123.30.212.10	A	mail.thanhdiaanhhung.mobi
123.30.212.53	A	mail39.aigvietnam.com
123.30.212.54	A	mail40.aigvietnam.com
123.30.212.55	A	mail41.aigvietnam.com
123.30.212.67	PTR	static.vdc.vn
123.30.212.67	A	sieuhoi.com
123.30.212.67	A	hochoctv.com
123.30.212.96	PTR	static.vdc.vn
123.30.212.96	A	muathe247.net
123.30.212.96	A	bannhadatchinhchu.com
123.30.212.97	PTR	static.vdc.vn
123.30.212.97	A	flchotelsamson.com
123.30.212.117	A	canhotokyquan12.com
123.30.212.131	A	mail.thegioitieudung.com.vn
123.30.212.133	A	quangcao68.net
123.30.212.133	A	www.quangcao68.net
123.30.212.133	A	nissan46.com
123.30.212.165	A	phuongthanhgroup.com
123.30.212.165	A	tribenhtainha.com
123.30.212.165	A	dqdung86.net
123.30.212.221	A	www.kemvaynen.com
123.30.212.221	A	rstars.vn
123.30.212.221	A	chungcunhadathanoi.com
123.30.213.7	A	choichit.com
123.30.213.7	A	luanvan.edu.vn
123.30.213.7	A	www.luanvan.edu.vn
123.30.213.31	A	mail.kiu.vn
123.30.213.65	PTR	static.vdc.vn
123.30.213.66	A	thien-kiem.net
123.30.213.66	A	mail.tuvanbaohiem24h.com
123.30.213.67	PTR	213-67.static.v1server.com
123.30.213.67	A	dns5.bizmacvn.net
123.30.213.67	A	ns.chuahoangphap.com.vn
123.30.213.100	A	mail.dongthanhceramic.com
123.30.213.100	A	dns2.bizmacvn.net
123.30.213.100	A	keodanthuanphong.com
123.30.213.166	A	www.vnfun.vn
123.30.213.166	A	mail.vnfun.vn
123.30.213.166	A	*.vnfun.vn
123.30.213.188	A	mail.krems.edu.vn
123.30.213.203	A	ns3.gslb.jobstreet.com.my
123.30.213.213	A	job-search.gslb.jobstreet.com.sg
123.30.213.213	A	job-search.gslb.jobstreet.com.ph
123.30.213.213	A	call-center-bpo.jobstreet.com.ph
123.30.214.1	PTR	static.vdc.vn
123.30.214.2	PTR	static.vdc.vn
123.30.214.3	PTR	static.vdc.vn
123.30.214.10	A	mail.cevietnam.com
123.30.214.28	A	vuoncai.com
123.30.214.32	PTR	static.vdc.vn
123.30.214.33	PTR	static.vdc.vn
123.30.214.34	PTR	static.vdc.vn
123.30.214.36	A	deche.mobi
123.30.214.36	A	colongtien.com
123.30.214.42	A	mail.tukiem.com
123.30.214.59	A	naruto.vn
123.30.214.64	PTR	static.vdc.vn
123.30.214.65	PTR	static.vdc.vn
123.30.214.66	PTR	static.vdc.vn
123.30.214.66	A	mail.dichvuhoadondientu.com
123.30.214.66	A	dichvuhoadondientu.com
123.30.214.67	PTR	static.vdc.vn
123.30.214.96	PTR	static.vdc.vn
123.30.214.97	PTR	static.vdc.vn
123.30.214.98	PTR	static.vdc.vn
123.30.214.99	PTR	static.vdc.vn
123.30.214.110	A	ebook.net.vn
123.30.214.111	A	truyenvui.vn
123.30.214.117	A	canhotokyquan12.com
123.30.214.121	A	daigiavietnam.net
123.30.214.128	PTR	static.vnpt.vn
123.30.214.129	PTR	static.vdc.vn
123.30.214.130	PTR	static.vdc.vn
123.30.214.131	PTR	static.vdc.vn
123.30.214.133	A	duanedenrosethanhliet.com
123.30.214.133	A	chungcugreenpearll.com
123.30.214.133	A	duan-athena.com
123.30.214.160	PTR	static.vdc.vn
123.30.214.160	A	mail.dancotravel.net
123.30.214.160	A	dancotravel.net
123.30.214.161	PTR	static.vdc.vn
123.30.214.162	PTR	static.vdc.vn
123.30.214.163	PTR	static.vnpt.vn
123.30.214.192	PTR	static.vdc.vn
123.30.214.192	A	mail.noithatruby.vn
123.30.214.192	A	alltraveltips.net
123.30.214.193	PTR	static.vnpt.vn
123.30.214.194	PTR	static.vdc.vn
123.30.214.195	PTR	static.vdc.vn
123.30.214.224	PTR	static.vnpt.vn
123.30.214.225	PTR	static.vnpt.vn
123.30.214.226	PTR	static.vdc.vn
123.30.214.226	A	diendanviet.vn
123.30.214.226	A	khochangagoidem.com
123.30.214.227	PTR	static.vnpt.vn
123.30.215.0	PTR	static.vdc.vn
123.30.215.1	PTR	static.vdc.vn
123.30.215.2	PTR	static.vdc.vn
123.30.215.12	A	kenh143.vcmedia.vn
123.30.215.15	A	admicro1.vcmedia.vn
123.30.215.16	A	tto.tuoitre.vn
123.30.215.16	A	m.kenh14.vn
123.30.215.18	A	japana.vn
123.30.215.19	A	japana.vn
123.30.215.32	PTR	static.vdc.vn
123.30.215.34	PTR	static.vdc.vn
123.30.215.35	PTR	static.vdc.vn
123.30.215.39	A	ns3.cdn.vccloud.vn
123.30.215.43	A	s1-hcm.sohatv.vn
123.30.215.45	A	japana.vn
123.30.215.50	A	ns4.cdn.vccloud.vn
123.30.215.55	A	japana.vn
123.30.215.64	PTR	static.vdc.vn
123.30.215.65	PTR	static.vdc.vn
123.30.215.65	A	s2-hcm.sohatv.vn
123.30.215.67	PTR	static.vdc.vn
123.30.215.69	A	s3-hcm.sohatv.vn
123.30.215.71	A	s4-hcm.sohatv.vn
123.30.215.72	A	s5-hcm.sohatv.vn
123.30.215.96	PTR	static.vdc.vn
123.30.215.97	PTR	static.vdc.vn
123.30.215.98	PTR	static.vdc.vn
123.30.215.99	PTR	static.vdc.vn
123.30.215.129	PTR	static.vdc.vn
123.30.215.131	PTR	static.vdc.vn
123.30.215.160	PTR	static.vdc.vn
123.30.215.162	PTR	static.vdc.vn
123.30.215.191	A	111gamesieunhansamset.com
123.30.215.192	A	141taigamechemtraicay.net
123.30.215.193	PTR	static.vdc.vn
123.30.215.194	PTR	static.vdc.vn
123.30.215.194	A	fifa12.net
123.30.215.195	PTR	static.vdc.vn
123.30.215.195	A	gamedaovangdoi.com
123.30.215.195	A	gameduaxevuotdiahinh.com
123.30.215.224	PTR	static.vdc.vn
123.30.215.225	PTR	static.vdc.vn
123.30.215.226	PTR	static.vdc.vn
123.30.215.227	PTR	static.vdc.vn
123.30.215.230	A	hoadecor.com
123.30.215.230	A	kull-studio.com
123.30.215.230	A	effecttap.com
123.30.215.249	A	mail.tekkenbasara.mobi
123.30.216.32	PTR	dynamic.vnpt.vn
123.30.216.34	PTR	dynamic.vnpt.vn
123.30.216.117	A	canhotokyquan12.com
123.30.216.163	PTR	dynamic.vnpt.vn
123.30.219.128	PTR	dynamic.vnpt.vn