Robtex

Up: 64.81.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.81.48.0/23
Down right: 64.81.50.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.81.48.0	A+PTR	dsl081-048-000.sfo1.dsl.speakeasy.net
64.81.48.8	PTR	dsl081-048-008.sfo1.dsl.speakeasy.net
64.81.48.8	A	newatlantis.isle.org
64.81.48.10	PTR	dsl081-048-010.dsl-isp.net
64.81.48.10	A	zibelda.mk2ventures.com
64.81.48.10	A	mail.mk2ventures.com
64.81.48.14	PTR	ns1.hamachi.us
64.81.48.18	PTR	home.meat.net
64.81.48.18	A	kevinbergner.com
64.81.48.19	PTR	pianosa.catch22.org
64.81.48.19	A	mail.kevinbergner.com
64.81.48.31	A	hellboundhandbasket.net
64.81.48.58	PTR	ramen.quinn.com
64.81.48.71	PTR	gbl.bayard.net
64.81.48.72	PTR	thor.piquan.org
64.81.48.72	A	holveck.name
64.81.48.72	A	piqnet.org
64.81.48.78	A	dsl081-048-078.sfo1.dsl.speakeasy.net
64.81.48.107	A	mail.ivigilant.com
64.81.48.111	PTR	comfychair.org
64.81.48.112	A+PTR	eagle.vmhome.com
64.81.48.139	PTR	lore.us
64.81.48.165	PTR	dsl081-048-165.sfo1.dsl.speakeasy.net
64.81.48.166	PTR	mail.pinger.com
64.81.48.169	PTR	www.p6r.com
64.81.48.172	PTR	mail1.sfspruce.net
64.81.48.172	A	mail.crocum.com
64.81.48.179	PTR	vosill.nog.net
64.81.48.199	PTR	dsl081-048-199.sfo1.dsl.speakeasy.net
64.81.48.199	A	smtp.equipmentsupplyco.com
64.81.48.210	PTR	lore.ca
64.81.49.4	A+PTR	dsl081-049-004.sfo1.dsl.speakeasy.net
64.81.49.25	A	xcede.net
64.81.49.178	A	dsl081-049-178.sfo1.dsl.speakeasy.net
64.81.49.222	PTR	mx.netarbeiter.com
64.81.49.254	A	mocek.us
64.81.50.5	A	kevincrisafulli.com
64.81.50.45	A+PTR	dsl081-050-045.sfo1.dsl.speakeasy.net
64.81.50.65	A+PTR	thalia.aoaioxxysz.net
64.81.50.65	A	cryptonomi.com
64.81.50.65	A	starshards.org
64.81.50.67	PTR	aglaia.aoaioxxysz.net
64.81.50.68	A	moirae.aoaioxxysz.net
64.81.50.68	A	charites.aoaioxxysz.net
64.81.50.98	PTR	dsl081-050-098.sfo1.dsl.speakeasy.net
64.81.51.24	A	*.mytasklist.com
64.81.51.24	A	mytimebilling.com
64.81.51.24	A	mytasklist.com
64.81.51.30	PTR	capricorn.dwc-west.net
64.81.51.30	A	www.the-goldmans.net
64.81.51.30	A	ns.answermac.net
64.81.51.40	PTR	cancer.dwc-west.net
64.81.51.40	A	learn2c.com
64.81.51.40	A	mybidtool.com
64.81.51.41	PTR	mail.rti-zone.org
64.81.51.45	PTR	nat.earth.threerings.net
64.81.51.57	PTR	experimental.chrisbowman.com
64.81.51.125	PTR	comsat.earth.threerings.net
64.81.51.129	A	mx2.foneweb.net
64.81.51.157	A	kindlenotes.net
64.81.51.159	PTR	entheogen.net
64.81.51.171	PTR	dsl081-051-171.sfo1.dsl.speakeasy.net
64.81.51.184	PTR	mail.pdc-racing.net
64.81.51.198	PTR	belmont.mjdb.com
64.81.51.218	A	alliandadam.com
64.81.51.243	PTR	dsl081-051-243.sfo1.dsl.speakeasy.net