Robtex

Up: 168.221.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 168.221.0.0/20
Down right: 168.221.16.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
168.221.6.10	PTR	ns1.rookdns.com
168.221.6.10	A	riskmanagement.dadeschools.net
168.221.6.10	A	schooldashboards.dadeschools.net
168.221.6.66	PTR	collaborationportal.dadeschools.net
168.221.6.66	PTR	communityportal.dadeschools.net
168.221.6.66	PTR	parentportal.dadeschools.net
168.221.6.80	PTR	portalapps.dadeschools.net
168.221.6.90	A	webapps.dadeschools.net
168.221.18.2	A	smtp-02.dadeschools.net
168.221.18.2	A	susqas.dadeschools.net
168.221.18.2	A	susppd.dadeschools.net
168.221.18.3	A+PTR	smtp-00.dadeschools.net
168.221.18.4	PTR	smtp-03.dadeschools.net
168.221.18.6	A	susqas.dadeschools.net
168.221.18.6	A	susppd.dadeschools.net
168.221.18.230	A+PTR	ehandbooks.dadeschools.net
168.221.18.230	A+PTR	home.dadeschools.net
168.221.18.230	PTR	mobile.dadeschools.net
168.221.21.6	PTR	ns41.rookdns.com
168.221.21.24	PTR	ns1.rookdns.com
168.221.21.25	A	gb.dadeschools.net
168.221.21.28	A	pki.dadeschools.net
168.221.21.30	A	sbr.dadeschools.net
168.221.21.30	A	myportal.dadeschools.net
168.221.21.35	PTR	tlconline.dadeschools.net
168.221.21.35	PTR	cpadult.dadeschools.net
168.221.21.35	PTR	northdadecenterformodernlanguages.dadeschools.net
168.221.21.36	PTR	adultesolprogram.dadeschools.net
168.221.21.36	PTR	aidseducation.dadeschools.net
168.221.21.36	PTR	attachmentmanagerfiles.dadeschools.net
168.221.21.39	A	riskmanagement.dadeschools.net
168.221.21.39	A	ebdprogram.dadeschools.net
168.221.21.39	A	regionii.dadeschools.net
168.221.21.54	A	westland.dadeschools.net
168.221.21.54	A	mnorland.dadeschools.net
168.221.21.82	A	studentsreset.dadeschools.net
168.221.21.83	A	mdcpsportal.dadeschools.net
168.221.21.85	A	mdcpsportalapps2.dadeschools.net
168.221.21.97	PTR	news.dadeschools.net
168.221.21.97	A	api.dadeschools.net
168.221.21.97	A	superintendent.dadeschools.net
168.221.21.98	A+PTR	collaborationportal.dadeschools.net
168.221.21.102	A	studentportal.dadeschools.net
168.221.21.129	PTR	dadeschools.net
168.221.21.129	PTR	bakeraviation.dadeschools.net
168.221.21.129	A+PTR	crestview.dadeschools.net
168.221.21.200	A	ns2.dade.k12.fl.us
168.221.25.12	A	mdcpsrefresh.dadeschools.net
168.221.27.92	A	calendar.dadeschools.net
168.221.27.122	A	destiny.dadeschools.net
168.221.28.11	A	apps.dadeschools.net
168.221.28.12	A+PTR	mdcpsrefresh.dadeschools.net
168.221.28.14	A	mdcpsfedserv.dadeschools.net
168.221.28.22	A	md.dadeschools.net
168.221.28.85	A	toolkit.dadeschools.net
168.221.28.85	A	district6.dadeschools.net
168.221.28.85	A	earlychildhood.dadeschools.net
168.221.28.104	A	freeandreducedmealapp.dadeschools.net
168.221.28.108	A+PTR	auth.dadeschools.net
168.221.29.24	A	gradebook.dadeschools.net
168.221.29.25	A	gb.dadeschools.net