Robtex

Up: 203.81.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 203.81.60.0/23
Down right: 203.81.62.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.81.60.130	A	survey.nokia-asia.com
203.81.60.163	PTR	mail.readyserver.net
203.81.60.173	PTR	leadership-solutions.com.sg
203.81.60.180	PTR	mail4.readyserver.net
203.81.60.226	PTR	mail.data.com.sg
203.81.60.233	PTR	mail.fil.com.sg
203.81.61.10	A	*.gmsasiapacific.com
203.81.61.10	A	gms-webmail1.gmsasiapacific.com
203.81.61.10	A	mail2.premierclubhotels.com
203.81.61.18	PTR	seafood.singhost.com
203.81.61.18	A	developers.sg
203.81.61.18	A	www.devs.sg
203.81.61.26	A	*.globalindian.org.sg
203.81.61.98	PTR	mail.vmail.org
203.81.61.98	A	*.theyaps.com
203.81.61.98	A	theyaps.com
203.81.61.106	PTR	wm.ufinity.com
203.81.61.163	A	mx.great2fly.com
203.81.61.163	A	mail.hrpremium.com
203.81.61.164	A	hrpremium.com
203.81.61.226	A+PTR	compart.pacweb.net.sg
203.81.61.227	A+PTR	compart2.pacweb.net.sg
203.81.62.83	A	ctlclaw.com.sg
203.81.62.83	A	mailcurrent.org
203.81.62.83	A	aluminiumgrill.com.sg
203.81.62.118	A	rdns1.expertvm.com
203.81.63.226	A	cat29-com-honeywell.pacific.net.sg
203.81.63.227	A	cat29-com-noc.pacific.net.sg
203.81.63.228	A	cat29-pas-a1.pacific.net.sg
203.81.63.233	A+PTR	cat29-pas-b3.pacific.net.sg
203.81.63.233	PTR	cat29-pas-b3.idc.pacific.net.sg
203.81.63.235	A	cat29-com-b4.pacific.net.sg
203.81.63.238	PTR	cat35-com-b3.pacific.net.sg
203.81.63.238	PTR	cat35-com-b3.idc.pacific.net.sg
203.81.63.239	A+PTR	cat29-pas-d12.pacific.net.sg
203.81.63.239	PTR	cat29-pas-d12.idc.pacific.net.sg
203.81.63.240	PTR	cat29-pas-d12-2.pacific.net.sg
203.81.63.243	A+PTR	cat29-com-b2.pacific.net.sg
203.81.63.245	A+PTR	cat29-pas-d12-4.pacific.net.sg
203.81.63.246	A+PTR	cat29-pas-b6.pacific.net.sg
203.81.63.250	PTR	cat35-com-b4.pacific.net.sg
203.81.63.253	A	cat29-pas-e10.idc.pacific.net.sg