Robtex

Up: 204.15.100.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 204.15.100.0/25
Down right: 204.15.100.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
204.15.100.1	A	fw1.redanvil.net
204.15.100.2	A	exchange.redanvil.net
204.15.100.3	A	update.redanvil.net
204.15.100.4	A	voip.redanvil.net
204.15.100.5	A	facility.redanvil.net
204.15.100.8	A+PTR	204-15-100-8.rev.redanvil.net
204.15.100.20	PTR	204-15-100-20-rev.redanvil.net
204.15.100.20	A	ns1.zrinsky.us
204.15.100.21	PTR	204-15-100-21-rev.redanvil.net
204.15.100.21	A	ns2.zrinsky.us
204.15.100.25	A	levee.hack.net
204.15.100.26	A	mail.rivetedstudios.org
204.15.100.26	A	rivetedstudios.com
204.15.100.26	A	mail.rivetedstudios.com
204.15.100.27	PTR	edina.hack.net
204.15.100.27	A	www.appliedatomics.com
204.15.100.29	A+PTR	toneloc.phreak.net
204.15.100.30	A+PTR	limbo.phreak.net
204.15.100.36	PTR	204-15-100-36-rev.redanvil.net
204.15.100.36	A	peiperpower.com
204.15.100.36	A	maurerelectric.com
204.15.100.43	PTR	204-15-100-43-rev.redanvil.net
204.15.100.53	A	psi.wels.net
204.15.100.70	PTR	204-15-100-70-rev.redanvil.net
204.15.100.70	A	webmail.orionweb.net
204.15.100.77	A	predictinc.com
204.15.100.85	A	mwke.derivactiv.com
204.15.100.101	A+PTR	mail.avagonow.com
204.15.100.102	A	enewslettercentral.com
204.15.100.107	A	204-15-100-107.rev.redanvil.net
204.15.100.127	A+PTR	204-15-100-127.rev.redanvil.net
204.15.100.143	A	techwritingpartners.org
204.15.100.143	A	techwritingpartners.net
204.15.100.154	A	mailfilter.encaptech.com
204.15.100.198	A	www.lakelandsupply.com
204.15.100.198	A	lakelandsupply.com
204.15.100.199	PTR	ctc-fmclst.caspiansvcs.com
204.15.100.199	A	mail2.caspiantek.com
204.15.100.199	A	mailsvr.eagleprepstl.org
204.15.100.208	A+PTR	stmail01.thinkcaspian.com
204.15.100.219	PTR	caspian-fm400.caspiansvcs.com
204.15.100.219	A	mail.thinkcaspian.com
204.15.100.219	A	mail.adamsuring.com
204.15.100.220	A	remote.remybattery.com
204.15.100.225	A+PTR	204-15-100-225.rev.redanvil.net
204.15.100.225	A	liquitec.us
204.15.100.225	A	liquitec.com
204.15.100.226	A	accexc1.accuval.net
204.15.100.232	A	proofbox.net