Robtex

Up: 221.133.0.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 221.133.1.0/25
Down right: 221.133.1.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
221.133.1.1	A+PTR	hcmc2.saigonnet.vn
221.133.1.2	PTR	hcmc3.saigonnet.vn
221.133.1.3	PTR	hcmc5.saigonnet.vn
221.133.1.4	PTR	mail.store2.spt.vn
221.133.1.4	A	mail.tramdungnghibinhan.vn
221.133.1.4	A	mail.store.spt.vn
221.133.1.6	A+PTR	mail.store3.spt.vn
221.133.1.6	A	mailserver.snetfone.com.vn
221.133.1.6	A	mail.bongraytai.com
221.133.1.12	PTR	store.spt.vn
221.133.1.17	PTR	wmail.saigonnet.vn
221.133.1.18	PTR	mail.cyvee.com
221.133.1.18	PTR	mail.cyveemail.com
221.133.1.18	PTR	mail.bross.vn
221.133.1.24	PTR	mail.spt.vn
221.133.1.37	PTR	mail.web37.ipt.vn
221.133.1.37	A	mail.datrifood.com
221.133.1.37	A	sgtelecom.vn
221.133.1.39	A	test.ipt.vn
221.133.1.40	A	nhavesinhsachkhuan.com
221.133.1.40	A	briteimpressionsdental.com
221.133.1.41	PTR	mail.saigonnews.vn
221.133.1.41	A	mail.saigonnews.com.vn
221.133.1.41	A	suasacdep.com
221.133.1.42	PTR	mail.web1.ipt.vn
221.133.1.42	A	ximangtaydo.info
221.133.1.42	A	phuquoctourist.vn
221.133.1.44	PTR	mail.saigonpostel.com.vn
221.133.1.45	PTR	mail.ipt.vn
221.133.1.46	PTR	gwserv1.spt.vn
221.133.1.47	PTR	mail.web47.ipt.vn
221.133.1.47	A	dongsongnho.com
221.133.1.47	A	cuoihoi24h.com
221.133.1.49	A+PTR	web49.ipt.vn
221.133.1.49	A	mail.phuquochotel.net
221.133.1.49	A	casinophuquoc.net
221.133.1.50	PTR	mail.bachvietdt.vn
221.133.1.50	PTR	mail.bachvietdt.com.vn
221.133.1.50	PTR	mail.bvmedia.com.vn
221.133.1.51	A	mail.itvip24h.com
221.133.1.51	A	www.hcmtax.gov.vn
221.133.1.51	A	speedtest07.spt.vn
221.133.1.52	PTR	mail.mesa.vn
221.133.1.52	PTR	mailserver.mesa.com.vn
221.133.1.52	PTR	mail.mld.mesa.vn
221.133.1.56	A+PTR	mail.store1.spt.vn
221.133.1.56	A	mail.dangkytenmien.vn
221.133.1.57	A	sptfone.com.vn
221.133.1.57	A	stc.spt.vn
221.133.1.57	A	*.sptfone.vn
221.133.1.59	PTR	mail2.mx.dangkytenmien.vn
221.133.1.59	A	mail.store1.spt.vn
221.133.1.59	A	mail.goldenquality.vn
221.133.1.60	PTR	mail.spt.vn
221.133.1.60	A	mail.saigonpostel.com.vn
221.133.1.75	A+PTR	mail.web75.ipt.vn
221.133.1.75	A	web75.ipt.vn
221.133.1.77	A	snetfone.com.vn
221.133.1.88	PTR	mail.web88.ipt.vn
221.133.1.88	A	inetns1.thuemaytinh.com.vn
221.133.1.88	A	galleries.thuemaytinh.com.vn
221.133.1.89	A	s-wifi.net
221.133.1.89	A	manhinhleddientu.com
221.133.1.89	A	lamdepgiare.com
221.133.1.136	A+PTR	mail1.noc.ipt.vn
221.133.1.142	PTR	demo.saigonnet.vn
221.133.1.167	PTR	mail.test.saigonnet.vn
221.133.1.176	A+PTR	mail.noc.ipt.vn