Robtex

Up: 216.203.32.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 216.203.32.0/23
Down right: 216.203.34.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.203.32.147	PTR	ns0.spencerstuart.com
216.203.32.147	A	ns2.spencerstuart.com
216.203.32.149	PTR	www.spencerstuart.com
216.203.32.152	PTR	ftp.spencerstuart.com
216.203.32.208	A+PTR	chicma-mta1.messageone.com
216.203.32.218	A	chiafge-1.messageone.com
216.203.33.12	A	ea.stats.com
216.203.33.34	PTR	wdlir1-ge-0-1-0-315.sgns.net
216.203.33.35	PTR	wdlir2-ge-0-1-0-315.sgns.net
216.203.33.36	PTR	wdlcntrs1.oamp.sgns.net
216.203.33.44	PTR	wdlcntrs2.oamp.sgns.net
216.203.33.130	A+PTR	wdlir1-ge-0-1-0-323.sgns.net
216.203.33.131	A+PTR	wdlir2-ge-0-1-0-323.sgns.net
216.203.33.132	PTR	wdlimcgf2.oamp.sgns.net
216.203.33.133	PTR	wdlimcgf1.oamp.sgns.net
216.203.33.137	PTR	imccban03.imcglobal.com
216.203.33.138	A	exchowa01.mosaicco.com
216.203.33.141	PTR	kcbelx01.imcglobal.com
216.203.33.142	PTR	aunorx01.imcglobal.com
216.203.33.146	A	mosaicco.de
216.203.33.146	A	mosaicco.com.mx
216.203.33.146	A	amigofiel.com.br
216.203.33.154	A	excowaprd1.mosaicco.com
216.203.33.155	A	excowaprd2.mosaicco.com
216.203.33.162	PTR	wdlir1-ge-0-1-0-311.sgns.net
216.203.33.163	PTR	wdlir2-ge-0-1-0-311.sgns.net
216.203.33.165	PTR	216-203-33-165-chicago.messageone.com
216.203.33.166	PTR	chiemsswpub-1.messageone.com
216.203.33.167	PTR	chiemsswpri-1.messageone.com
216.203.33.168	PTR	chiemslo-1.messageone.com
216.203.33.169	PTR	chiemslo-2.messageone.com
216.203.33.171	PTR	chiemsdb-1.messageone.com
216.203.33.172	PTR	chiemsms-1.messageone.com
216.203.33.173	PTR	emsmta.messageone.com
216.203.33.174	PTR	chiemsmtas1-1.messageone.com
216.203.33.175	PTR	chiemsmtas1-2.messageone.com
216.203.33.176	A	alertfind.com
216.203.33.178	A+PTR	chiemsmtas2-3.messageone.com
216.203.33.179	A+PTR	chiemsmtas2-4.messageone.com
216.203.33.180	A	gtiemergency.org
216.203.33.181	PTR	chiemsas-1.messageone.com
216.203.33.181	A	ems-ws.messageone.com
216.203.33.182	PTR	chiemsas-2.messageone.com
216.203.33.183	PTR	chiemsas-3.messageone.com
216.203.33.184	PTR	chiemsas-4.messageone.com
216.203.33.186	PTR	es4mta-1.messageone.com
216.203.33.188	PTR	es3mta-1.messageone.com
216.203.33.190	PTR	chiemsws-1.messageone.com
216.203.34.33	PTR	ilweb2.transre.com
216.203.34.33	A	trc.biz
216.203.34.33	A	neptunereholdings.com
216.203.34.37	A	www.fairco.com
216.203.34.37	A	www.transre.com
216.203.34.50	A	iladns.transre.com
216.203.34.86	A	mail.smartsignaldata.com
216.203.34.137	A	smtp.comdisco.net
216.203.34.238	A+PTR	chiemsmtas2-1.messageone.com
216.203.34.239	A	chiemsmtas2-2.messageone.com
216.203.35.67	A	mx30.coletaylor.com
216.203.35.75	A	ablreporterdr.com
216.203.35.118	PTR	wdlsvtgf2.oamp.sgns.net
216.203.35.140	A	stafftools.com
216.203.35.141	A	nospam.edamian.com
216.203.35.148	A+PTR	mail.edamian.com
216.203.35.148	A	smtp.chicagolawyers.com
216.203.35.148	A	mail.damianservices.com