Robtex

Up: 168.220.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 168.221.0.0/17
Down right: 168.221.128.0/17
(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
168.221.18.2	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
168.221.21.6	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
168.221.21.39	A	riskmanagement.dadeschools.net
168.221.21.39	A	ebdprogram.dadeschools.net
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
168.221.28.104	A	freeandreducedmealapp.dadeschools.net
168.221.29.24	A	gradebook.dadeschools.net
168.221.29.25	A	gb.dadeschools.net
168.221.53.55	A	ahs.dadeschools.net
168.221.53.55	A	american.dade.k12.fl.us
168.221.53.58	A	cghs.dade.k12.fl.us
168.221.53.67	A	crhs.dadeschools.net
168.221.54.12	A+PTR	deals.dadeschools.net
168.221.54.12	A+PTR	miamidade.dadeschools.net
168.221.54.12	A+PTR	police.dadeschools.net
168.221.54.13	PTR	marketplace.dadeschools.net
168.221.55.2	A	reagandoral.dadeschools.net
168.221.56.46	A	mdcpsfedserv.dadeschools.net
168.221.161.2	PTR	ns1.rookdns.com
168.221.163.137	A	freeandreducedmealapp.dadeschools.net