Robtex

Up: 203.123.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 203.123.0.0/22
Down right: 203.123.4.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
203.123.0.218	PTR	218.203-123-0.ngn.m1net.com.sg
203.123.1.2	PTR	avxasia.com.sg
203.123.1.10	PTR	10.203-123-1.leased.qala.com.sg
203.123.1.18	PTR	harryelias.com.sg
203.123.1.51	PTR	fhl.com.sg
203.123.1.51	PTR	51.203-123-1.leased-203-123-1.qala.com.sg
203.123.1.70	A	www.labroy.com.sg
203.123.1.74	A+PTR	labroy.com.sg
203.123.1.74	A	mail1.drydocks-graha.com
203.123.1.74	A	mail.labroy.com.sg
203.123.1.80	PTR	80.203-123-1.leased-203-123-1.qala.com.sg
203.123.1.104	PTR	104.203-123-1.leased-203-123-1.qala.com.sg
203.123.1.163	PTR	ipco.com.sg
203.123.2.4	A+PTR	4.203-123-2.1500adsl.qala.com.sg
203.123.2.5	A	5.203-123-2.1500adsl.qala.com.sg
203.123.2.6	A	6.203-123-2.1500adsl.qala.com.sg
203.123.2.9	A+PTR	9.203-123-2.1500adsl.qala.com.sg
203.123.2.9	A	astigroup.com
203.123.2.9	A	astiholdingslimited.com
203.123.2.11	A+PTR	11.203-123-2.1500adsl.qala.com.sg
203.123.2.18	A+PTR	18.203-123-2.1500adsl.qala.com.sg
203.123.2.22	A	22.203-123-2.1500adsl.qala.com.sg
203.123.2.24	A+PTR	24.203-123-2.1500adsl.qala.com.sg
203.123.2.29	A	29.203-123-2.1500adsl.qala.com.sg
203.123.2.30	A	30.203-123-2.1500adsl.qala.com.sg
203.123.2.32	PTR	32.203-123-2.1500adsl.qala.com.sg
203.123.2.35	A+PTR	35.203-123-2.1500adsl.qala.com.sg
203.123.2.37	A	37.203-123-2.1500adsl.qala.com.sg
203.123.2.43	A+PTR	43.203-123-2.1500adsl.qala.com.sg
203.123.2.44	A	44.203-123-2.1500adsl.qala.com.sg
203.123.2.47	A	47.203-123-2.1500adsl.qala.com.sg
203.123.2.51	A+PTR	51.203-123-2.1500adsl.qala.com.sg
203.123.2.58	PTR	58.203-123-2.1500adsl.qala.com.sg
203.123.2.61	A	61.203-123-2.1500adsl.qala.com.sg
203.123.2.62	A	62.203-123-2.1500adsl.qala.com.sg
203.123.2.66	A+PTR	66.203-123-2.1500adsl.qala.com.sg
203.123.2.73	A+PTR	73.203-123-2.1500adsl.qala.com.sg
203.123.2.85	A	85.203-123-2.1500adsl.qala.com.sg
203.123.2.87	A	87.203-123-2.1500adsl.qala.com.sg
203.123.2.99	A+PTR	99.203-123-2.1500adsl.qala.com.sg
203.123.2.103	A	103.203-123-2.1500adsl.qala.com.sg
203.123.2.105	A+PTR	105.203-123-2.1500adsl.qala.com.sg
203.123.2.106	A+PTR	106.203-123-2.1500adsl.qala.com.sg
203.123.2.112	A+PTR	112.203-123-2.1500adsl.qala.com.sg
203.123.2.114	A+PTR	114.203-123-2.1500adsl.qala.com.sg
203.123.2.125	A	125.203-123-2.1500adsl.qala.com.sg
203.123.2.127	A	127.203-123-2.1500adsl.qala.com.sg
203.123.2.128	PTR	128.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.130	PTR	130.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.138	PTR	138.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.145	PTR	145.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.145	A	mail.geosoft.sg
203.123.2.146	PTR	146.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.146	A	mail.lubanix.com
203.123.2.147	PTR	147.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.147	A	www.lubanix.com
203.123.2.147	A	lubanix.com
203.123.2.152	PTR	152.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.161	PTR	router.mpfsc.org.sg
203.123.2.178	PTR	178.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.184	PTR	184.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.195	PTR	195.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.202	PTR	ips.org.sg
203.123.2.217	PTR	router.eguide.com.sg
203.123.2.218	PTR	218.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.227	PTR	flexnt1.flextech.com.sg
203.123.2.233	PTR	scm-sol.com
203.123.2.234	PTR	nebula.flextech.com.sg
203.123.2.235	PTR	235.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.241	PTR	router.leosin.com.sg
203.123.2.245	PTR	galeleo.com
203.123.2.248	PTR	248.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.249	PTR	249.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.250	PTR	250.203-123-2.leased-203-123-2.qala.com.sg
203.123.2.251	PTR	251.203-123-2.leased-203-123-2.qala.com.sg
203.123.3.8	A+PTR	nx.swiftech.net.sg
203.123.3.8	A	ns2.swiftech.net.sg
203.123.3.130	PTR	130.203-123-3.static.qala.com.sg
203.123.3.130	A	simedarby.com.sg
203.123.3.130	A	www.simedarby.com.sg
203.123.3.138	PTR	138.203-123-3.static.qala.com.sg
203.123.3.138	A	ns1.diyregistrar.com
203.123.3.139	PTR	139.203-123-3.static.qala.com.sg
203.123.3.144	PTR	144.203-123-3.static.qala.com.sg
203.123.3.163	A	moxa2.swiftech.net.sg
203.123.3.225	PTR	225.203-123-3.static.qala.com.sg
203.123.4.10	PTR	10.203-123-4.ngn.m1net.com.sg
203.123.4.179	A	179.203-123-4.adsl.qala.com.sg
203.123.5.26	PTR	26.203-123-5.ngn.m1net.com.sg
203.123.5.26	A	sh-cogent.com.sg
203.123.5.51	PTR	51.203-123-5.ngn.m1net.com.sg
203.123.5.51	A	elna-sin.com.sg
203.123.5.60	A	mail.chs.moe.edu.sg
203.123.5.98	PTR	www.pub.gov.sg
203.123.5.251	PTR	251.203-123-5.ngn.m1net.com.sg
203.123.6.8	A	8.203-123-6.adsl.qala.com.sg
203.123.6.9	A	9.203-123-6.adsl.qala.com.sg
203.123.6.12	A	presidium-instruments.com
203.123.6.14	A	14.203-123-6.adsl.qala.com.sg
203.123.6.21	A	21.203-123-6.adsl.qala.com.sg
203.123.6.29	A	29.203-123-6.adsl.qala.com.sg
203.123.6.32	PTR	32.203-123-6.adsl.qala.com.sg
203.123.6.35	A	35.203-123-6.adsl.qala.com.sg
203.123.6.42	A	42.203-123-6.adsl.qala.com.sg
203.123.6.43	A	43.203-123-6.adsl.qala.com.sg
203.123.6.56	PTR	56.203-123-6.adsl.qala.com.sg
203.123.6.58	A+PTR	58.203-123-6.adsl.qala.com.sg
203.123.6.218	A+PTR	218.203-123-6.1500adsl.qala.com.sg
203.123.6.252	A	252.203-123-6.1500adsl.qala.com.sg
203.123.7.148	A	ns1.kbassociates.org
203.123.7.150	A	exch.kbassociates.org
203.123.7.157	A	bankofindia.com.sg
203.123.7.162	PTR	mainsmtp.as.eculine.net
203.123.7.162	A	ecusin.eculine.net