Robtex

Up: 123.231.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 123.231.0.0/19
Down right: 123.231.32.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
123.231.0.9	PTR	isg.dialogbb.net
123.231.0.33	A+PTR	isg.dialogbb.net
123.231.0.75	A+PTR	mailgw.dialogsl.net
123.231.0.75	PTR	trend5.dialogsl.net.0.231.123.in-addr.arpa
123.231.0.76	A+PTR	mailgw.dialogsl.net
123.231.0.76	PTR	trend4.dialogsl.net.0.231.123.in-addr.arpa
123.231.0.90	PTR	mail.dialogbb.com
123.231.0.156	A+PTR	ldap.dialogbb.com
123.231.0.156	PTR	mail.ualink.lk
123.231.0.163	A	visionlinkmedia.lk
123.231.0.166	PTR	mx2.dialogbb.net
123.231.0.166	A	mailmx2.dialogbb.net
123.231.0.166	A	mx3.dialogbb.net
123.231.0.167	PTR	dns2.dialog.lk
123.231.4.5	A+PTR	ms1.broadnet.lk
123.231.4.8	A	ms2.broadnet.lk
123.231.4.11	A+PTR	ns1.broadnet.lk
123.231.4.14	A+PTR	ns2.broadnet.lk
123.231.4.67	A+PTR	ews1.broadnet.lk
123.231.4.70	A+PTR	ews2.broadnet.lk
123.231.4.73	A+PTR	mcu.broadnet.lk
123.231.4.75	A	smtp0.broadnet.lk
123.231.5.11	A	mx4.dialogbb.com
123.231.5.25	A+PTR	sgw1.dialogbb.com
123.231.5.25	A	mbb.dialog.lk
123.231.5.26	A+PTR	sgw1.dialogbb.com
123.231.5.33	A	dialoglive.lk
123.231.5.70	A	www.dialogbb.com
123.231.5.70	A	www.dialogsl.net
123.231.5.70	A	www.dialogtv.com
123.231.5.80	PTR	spamgtw02.dialog.lk
123.231.5.130	A+PTR	spamgtw01.dialog.lk
123.231.5.130	A	forti1.dialogsl.net
123.231.5.139	A	pop.dialogsl.net
123.231.5.141	A	iron1.dialognet.lk
123.231.6.18	A+PTR	d.nic.lk
123.231.6.18	A	ns-d.nic.lk
123.231.6.67	A	mail.mihinlanka.com
123.231.6.120	PTR	incgtw01.dialog.lk
123.231.6.123	A	spamlog.dialog.lk
123.231.6.125	A	outgtw-stdby.dialog.lk
123.231.8.82	A	teardrop-island.com
123.231.8.105	A	venus.adsuk.net
123.231.8.197	A	laebuy.com
123.231.9.37	A	mail1.starboxes.in
123.231.9.37	A	mail1.starpackaging.biz
123.231.9.89	PTR	office.lakpura.com
123.231.9.109	A	rainfallsrilanka.com
123.231.10.127	A	heraths.com
123.231.10.127	A	cecar.org
123.231.11.135	A+PTR	mmm.linklanka.lk
123.231.11.228	A	iwshris.com
123.231.12.23	A	lomapa.nl
123.231.12.23	A	mail.lomapa.nl
123.231.12.51	A+PTR	mails.fjgdesaram.com
123.231.12.80	A+PTR	mail3.dmslanka.com
123.231.12.97	A	mail2.marazak.com
123.231.12.133	A+PTR	mail2.natwealth.com
123.231.12.143	A	politics.lk
123.231.12.143	A	mail.garments.lk
123.231.12.143	A	mail.voiz.lk
123.231.12.187	PTR	mailgw.sicl.lk
123.231.12.195	A	mark-wo.net
123.231.12.233	A	gvs-agents.com
123.231.13.10	A+PTR	mail.maritimecmb.com
123.231.13.10	A	maritimecmb.com
123.231.13.134	A	jlanka.enetlk.com
123.231.13.146	A	mac000e53ed827f.ddns.eagleeyes.tw
123.231.14.13	A	waternet.lk
123.231.14.13	A	www.warisoba.lk
123.231.14.13	A	warisoba.lk
123.231.14.73	A+PTR	mails.fjgdesaram.lk
123.231.14.218	A+PTR	mail3.fpasrilanka.org
123.231.16.2	PTR	spamwall.sathsindu.com.lk
123.231.16.6	PTR	mailrelay.travelclub.com.lk
123.231.16.6	A	travelclub.com.lk
123.231.16.145	PTR	mail.tassgroup.lk
123.231.16.145	A	relay.ebaseasia.net
123.231.16.192	PTR	mx1.metalanka.com
123.231.16.217	A+PTR	mail.gallopstrading.com
123.231.16.217	A	gallopstrading.com
123.231.16.243	A	mail1.sankenoverseas.com
123.231.17.28	A+PTR	mail.milinda.org
123.231.17.38	A	golflk.mobi
123.231.17.38	A	wavenet.mobi
123.231.17.38	A	*.mcricket.mobi
123.231.17.74	A+PTR	mail.hansellanka.lk
123.231.17.82	PTR	mail.cmc.lk
123.231.17.82	PTR	sigiri.cmc.lk
123.231.17.82	A	nawala.mega.lk
123.231.17.120	A+PTR	lanka.returnpool.com
123.231.17.138	PTR	mail.coffeebean.lk
123.231.17.167	PTR	mail.openarc.lk
123.231.17.167	A	nethsarana.com
123.231.17.167	A	unisets.com
123.231.17.208	PTR	mail.arpicoprivilege.com
123.231.17.208	A	mobileemail.arpico.com
123.231.17.239	A+PTR	mails.aureos.com.lk
123.231.18.35	PTR	mail.tcct.lk
123.231.18.49	A	mail.nic.lk
123.231.18.49	A	wwwb.techcert.lk
123.231.18.49	A	ccb.nic.lk
123.231.18.66	PTR	gateway.providenceglobal.com.18.231.123.in-addr.arpa
123.231.18.66	A	gateway.providenceglobal.com
123.231.18.116	A+PTR	mails2.lumala.lk
123.231.18.123	A	oxigallefacehotel.com
123.231.18.135	A+PTR	tcct-ex2k10-01.tcct.lk
123.231.18.135	A	mail.tcct.lk
123.231.18.135	A	tcct.lk
123.231.18.206	A	mail.ebonyholdings.com
123.231.18.206	A	mail.rashimagmt.com
123.231.18.208	PTR	ebaseasia.net
123.231.18.208	PTR	mail.ebaseasia.com
123.231.18.208	PTR	mail.gpshippingltd.com
123.231.18.253	A	heliosl.com
123.231.18.253	A	testingtestingtesting.co.uk
123.231.20.17	A+PTR	mail.bates.lk
123.231.20.94	A+PTR	mail.arctech.lk
123.231.20.109	A	mail1.adsintranet.com
123.231.20.208	A+PTR	mail.dbg.lk
123.231.20.215	A+PTR	mail.prontolanka.lk
123.231.20.215	A	www.prontolanka.lk
123.231.20.254	A	mail06.eureka.lk
123.231.21.4	A+PTR	tux.kandysoftsl.com
123.231.21.13	A	mail.mmblgroup.com
123.231.21.27	A	kayjaysite.tk
123.231.21.67	A+PTR	mail2.barberyn.lk
123.231.21.84	A+PTR	authsmtp3.eureka.lk
123.231.21.98	A+PTR	mail.lbn.lk
123.231.21.101	PTR	gpstrack.sathsindu.com.lk
123.231.21.101	A+PTR	mail.sathsindu.com.lk
123.231.21.101	PTR	spamwall.sathsindu.com.lk
123.231.21.143	A+PTR	mail.jobsnet.lk
123.231.21.143	A	www.jobsnet.lk
123.231.21.143	A	jobsnet.lk
123.231.21.160	PTR	mail.efcolombo.com
123.231.21.160	PTR	mail.newasialines.lk
123.231.21.161	PTR	mail.efcolombo.com
123.231.21.243	PTR	mail.bposerviceslk.com
123.231.21.243	PTR	mail2.lakbima.lk
123.231.22.7	PTR	mail.unitedholidays.lk
123.231.22.23	A	mail.bimputhfinance.com
123.231.22.66	PTR	mail-server.minra.lk
123.231.22.81	PTR	mail.harrisbrushes.lk
123.231.22.100	A+PTR	mail.tristar.org
123.231.22.161	A	mail.durteksails.com
123.231.22.186	PTR	mail.barclays.lk
123.231.22.207	A+PTR	mail2.teatang.com
123.231.22.207	A	hostmaster.teatang.com
123.231.22.207	A	*.teatang.com
123.231.23.7	PTR	server.eflyer.lk
123.231.23.42	PTR	mail.agstaragri.com
123.231.23.42	A	www.agstaragri.com
123.231.23.84	PTR	server.epromo.lk
123.231.23.90	PTR	mail.iconlanka.lk
123.231.23.185	PTR	isp.unitedholidays.lk
123.231.23.238	A+PTR	mails.antlergroup.com
123.231.24.11	A	www.singer.lk
123.231.24.11	A	www.singersl.com
123.231.24.11	A	singer.lk
123.231.24.12	A	singerfinance.com
123.231.24.146	A	voicelogs.dialog.lk
123.231.25.101	A	mail2.satextile.com
123.231.25.213	PTR	mail.embellish-store.com
123.231.30.118	A	lankaclear.lk
123.231.33.225	A	apps.sltb.lk
123.231.36.2	PTR	ormail1.dialogsl.net
123.231.36.4	PTR	gateway4.startpoints.lk
123.231.36.4	A	gateway4.starpoints.lk
123.231.36.5	A+PTR	mailer1.ibuy.lk
123.231.36.5	A	mx0.ibuy.lk
123.231.36.6	A	mailer1.dialogaxiata.lk
123.231.39.181	A	guru.lk
123.231.39.181	A	www.youlead.lk
123.231.39.181	A	www.guru.lk
123.231.39.235	A	mail.lankacinema.com
123.231.39.235	A	mail.lankasportsnews.com
123.231.39.235	A	mail.sportsmin.gov.lk
123.231.44.111	A	mail.mreach.info
123.231.44.153	A	mail.ceylonteabrokers.com
123.231.44.206	A	ctsat.tk
123.231.44.207	A	happylife.lk
123.231.44.241	A	mail.sarasavi.org
123.231.45.47	A	mail.prontolanka.lk
123.231.45.54	A	mailstore.medsource.lk
123.231.45.175	A	boughtleaf.com
123.231.45.179	A	constructionlk.com
123.231.45.216	A	encryptionitsolutions.com
123.231.45.238	A	sgic.lk
123.231.45.238	A	mail.sgic.lk
123.231.45.241	A	nwp-cdwp.com
123.231.47.110	A	www.goodyear.lk
123.231.47.110	A	datsun.lk
123.231.47.110	A	automall.lk
123.231.49.100	A	ns2.seylan.lk
123.231.52.12	A	ns2.peoplesbank.lk
123.231.52.107	A	mail03.cict.lk
123.231.54.10	PTR	exchange02.dsitp.com
123.231.54.10	A	exchange02.dsiitp.com
123.231.55.50	A	sectelprortnc.com
123.231.55.53	A	sectel-rtnc.com
123.231.55.122	A	email.lankaclear.com
123.231.55.187	A	messenger.sfml.lk
123.231.56.188	A	adhub.lk
123.231.56.188	A	www.adhub.lk
123.231.58.156	A	eservices.slpost.gov.lk
123.231.59.181	A	submit.nic.lk
123.231.62.251	A	aespleng.com