Robtex

Up: 203.126.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.126.20.0/23
Down right: 203.126.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.126.20.19	PTR	imail.renci.org.sg
203.126.20.19	A	hockaik.com
203.126.20.70	PTR	sgtghb01.transcenden.com
203.126.20.70	A	transcenden.com
203.126.20.70	A	mx.transcenden.com
203.126.20.72	A+PTR	mx2.transcenden.com
203.126.20.226	A	mail.tenetsompo.com
203.126.20.226	A	tenetsompo.com
203.126.20.226	A	tenetsompo.com.sg
203.126.20.227	A	mail.ichannel.com.sg
203.126.20.230	A	mail.ichannel.sg
203.126.20.230	A	*.ichannel.sg
203.126.20.231	A	vdns.tenetsompo.com.sg
203.126.20.234	A+PTR	smtp.tenetsompo.com.sg
203.126.20.244	PTR	mail1.tenetsompo.com.sg
203.126.20.244	A	mail1.sompo.com.sg
203.126.20.245	PTR	mail2.tenetsompo.com.sg
203.126.20.245	A	mail2.sompo.com.sg
203.126.20.250	A	sompoinsurance.sg
203.126.20.250	A	mailer.sompoinsurance.sg
203.126.21.2	A	heinz.com.sg
203.126.21.2	A	mail.hjheinz.net
203.126.21.7	A+PTR	saeslsgex08.saesl.com.sg
203.126.21.132	A+PTR	mx1.msre.com.sg
203.126.21.132	A	mx2.msre.ie
203.126.21.196	A+PTR	mail.metatech-asia.com
203.126.21.196	A+PTR	mail.metatechasia.com
203.126.21.196	PTR	mail.metatech.com.sg
203.126.21.227	A	longevity.steinweg.com.sg
203.126.21.230	A+PTR	jurong.ironmail.steinweg.com
203.126.22.42	A	www.saesl.com.sg
203.126.22.42	A	saeslsgweb02.saesl.com.sg
203.126.22.43	A+PTR	saeslsgex07.saesl.com.sg
203.126.22.117	PTR	smtp0.tenetinsurance.com
203.126.22.117	PTR	smtp0.tenetsompo.com.sg
203.126.22.130	A+PTR	mail.neom.com.sg
203.126.22.130	A+PTR	neomsvr.neom.com.sg
203.126.22.162	A+PTR	thunder.sicc.com.sg
203.126.22.162	A	mail1.sicc.com.sg
203.126.22.163	PTR	webmail.sicc.com.sg
203.126.23.2	PTR	mail.mydata.com.sg
203.126.23.35	A	mail2.enerfo.sg
203.126.23.35	A	mail.enerfo.sg
203.126.23.40	A+PTR	mail.omegra.sg
203.126.23.51	PTR	sataweb.sata.com.sg
203.126.23.51	A	www.sata.com.sg
203.126.23.51	A	pridns.sata.com.sg
203.126.23.52	A+PTR	email.sata.com.sg
203.126.23.52	A	mailexch.sata.com.sg
203.126.23.54	PTR	secdns.sata.com.sg
203.126.23.54	A	secdns.sata.sg
203.126.23.54	A	smtp.sata.sg
203.126.23.58	PTR	email.sata.com.sg