Robtex

Up: 142.0.160.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 142.0.168.0/22
Down right: 142.0.172.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
142.0.168.19	A+PTR	mail01.newslettercontent.chronicle.com
142.0.168.20	A+PTR	mail02.newslettercontent.chronicle.com
142.0.168.21	A+PTR	mail03.newslettercontent.chronicle.com
142.0.168.23	A+PTR	mail01.seemore.zebra.com
142.0.168.23	PTR	23.168.eloqua.com
142.0.168.24	PTR	24.168.eloqua.com
142.0.168.24	A+PTR	mail02.seemore.zebra.com
142.0.168.25	PTR	25.168.eloqua.com
142.0.168.25	PTR	mail03.seemore.zebra.com
142.0.168.27	PTR	mail02.acspubs.org
142.0.168.28	A+PTR	mail03.acspubs.org
142.0.168.33	A+PTR	mail02.response.aonunited.com
142.0.168.34	A+PTR	mail03.response.aonunited.com
142.0.168.35	A+PTR	mail01.fans.mlse.com
142.0.168.36	A+PTR	mail01.fanservices.jaguars.com
142.0.168.48	A+PTR	mail02.paypal-now.com
142.0.168.63	A+PTR	mail01.link.pentonaviation.com
142.0.168.64	A+PTR	mail02.link.pentonaviation.com
142.0.168.65	A+PTR	mail03.link.pentonaviation.com
142.0.168.66	A+PTR	mail02.global.microstrategy.com
142.0.168.69	A+PTR	mail01.results.assuranceagency.com
142.0.168.73	A+PTR	mail01.link.pentonfinancialservices.com
142.0.168.74	A+PTR	mail02.link.pentonfinancialservices.com
142.0.168.75	A+PTR	mail03.link.pentonfinancialservices.com
142.0.168.76	A+PTR	mail01.link.pentonmanufacturing.com
142.0.168.80	A+PTR	mail02.link.pentonfoodnews.com
142.0.168.81	A+PTR	mail03.link.pentonfoodnews.com
142.0.168.85	A+PTR	mail01.link.pentoncem.com
142.0.168.86	A+PTR	mail02.link.pentoncem.com
142.0.168.92	A+PTR	mail01.link.pentondes.com
142.0.168.93	A+PTR	mail02.link.pentondes.com
142.0.168.94	A+PTR	mail03.link.pentondes.com
142.0.168.95	A+PTR	mail01.link.penton3.com
142.0.168.96	A+PTR	mail02.link.penton3.com
142.0.168.97	A+PTR	mail03.link.penton3.com
142.0.168.100	A+PTR	mail01.link.pentonlsm.com
142.0.168.101	A+PTR	mail02.link.pentonlsm.com
142.0.168.119	A+PTR	mail01.hockey.floridapanthers.com
142.0.168.120	A+PTR	mail02.events.thebbtcenter.com
142.0.168.129	A+PTR	mail01.e.infoblox.com
142.0.168.148	A+PTR	mail01.go.cloudera.com
142.0.168.158	A+PTR	mail.public.pbs.org
142.0.168.164	A+PTR	mail01.link.pentonauto.com
142.0.168.165	A+PTR	mail02.link.pentonauto.com
142.0.168.166	A+PTR	mail03.link.pentonauto.com
142.0.168.176	A+PTR	mail01.smbdirect.lenovo.com
142.0.168.177	A+PTR	mail02.smbdirect.lenovo.com
142.0.168.178	A+PTR	mail03.smbdirect.lenovo.com
142.0.168.182	A+PTR	mail.go.qiagen.com
142.0.168.184	A+PTR	mail01.info.edc.ca
142.0.168.187	A+PTR	mail04.response.dell.com
142.0.168.191	A+PTR	mail01.go.firsttechfed.com
142.0.168.192	A	mail02.go.firsttechfed.com
142.0.168.193	A+PTR	mail03.go.firsttechfed.com
142.0.168.194	A+PTR	mail01.comm.aia.com.hk
142.0.168.213	A+PTR	mail01.info.zetes.com
142.0.168.216	A	mail01.communication.maerskline.com
142.0.169.95	A	comm.aia.com.hk
142.0.169.100	A	business-cards.americanexpress.com
142.0.169.101	A	go.qiagen.com
142.0.169.104	A	auce.americanexpress.com
142.0.169.111	A	enews.roche.com
142.0.169.114	A	fxipreferral.americanexpress.com
142.0.169.116	A	el.linkedin.com
142.0.169.117	A	info2.microstrategy.com
142.0.172.7	PTR	mail01.t1.terrapinn.com
142.0.172.14	A+PTR	mail01.goal.edmontonoilers.com
142.0.172.21	A+PTR	mail02.communications.idera.com
142.0.172.95	PTR	mail03.electricalsector.eaton.com
142.0.173.1	A	173.1.209.65
142.0.173.1	A	app.compendium.com
142.0.173.2	A	renters.apartments.com
142.0.173.2	A	blog.starcite.com
142.0.173.130	A	email.wisdomtree.com
142.0.173.130	A	qa-ma-philips-hc.com
142.0.173.130	A	newsletter.govdeals.com
142.0.173.140	A	secure.p02.eloqua.com
142.0.173.140	A	fumiko0613.com
142.0.173.140	A	techmdemo123.com
142.0.173.144	A	p02.hs.eloqua.com
142.0.173.145	A	login.eloqua.com
142.0.174.3	A+PTR	mail01.marketing.swisspost.com
142.0.174.3	A	response.marketing.swisspost.com
142.0.174.4	A+PTR	mail01.customers.kronos.com
142.0.174.13	A+PTR	mail03.updates.uscurrency.gov
142.0.174.22	A+PTR	mail03.financial-risk-solutions.thomsonreuters.info
142.0.174.23	A+PTR	mail02.financial-risk-solutions.thomsonreuters.info
142.0.174.24	A+PTR	mail01.financial-risk-solutions.thomsonreuters.info
142.0.174.39	A	mail01.info.pentontech.com
142.0.174.40	A+PTR	mail02.info.pentontech.com
142.0.174.41	A+PTR	mail03.info.pentontech.com
142.0.174.42	A+PTR	mail01.engage.elliemae.com
142.0.174.43	A+PTR	mail01.serviceapps.easyvista.com
142.0.174.52	A+PTR	mail01.response.rsmus.com
142.0.174.54	A+PTR	mail01.resources.changepoint.com
142.0.174.83	A+PTR	mail01.insight.domo.com
142.0.174.84	A+PTR	mail01.newsletter.irondirect.com
142.0.174.85	A+PTR	mail02.newsletter.irondirect.com
142.0.174.91	A+PTR	mail01.learn.hmhco.com
142.0.174.96	A+PTR	mail01.communications.idera.com
142.0.174.96	A	mail01.communications.aquafold.com
142.0.174.111	A+PTR	mail01.wiredata.extrahop.com
142.0.174.136	A+PTR	mail01.success.bluewolf.com
142.0.174.141	A+PTR	mail01.protect-us.eset.com
142.0.174.158	A+PTR	mail01.go.economist.com
142.0.174.164	A+PTR	maile01.lauthorities.com
142.0.174.187	PTR	mail01.news.sonosite.com
142.0.174.187	PTR	187.174.eloqua.com
142.0.174.231	A+PTR	mail02.mail.nescafe-dolcegusto.com.br
142.0.175.70	A	elqtest01.net
142.0.175.70	A	testonstg01.com