Robtex

Up: 66.90.56.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.90.60.0/23
Down right: 66.90.62.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.90.60.38	PTR	node.smartcity.net
66.90.60.105	PTR	node.smartcity.net
66.90.60.177	PTR	node.smartcity.net
66.90.60.212	PTR	node.smartcity.net
66.90.60.217	PTR	node.smartcity.net
66.90.61.114	A	ns3.sgginteractive.com
66.90.61.114	A	mail.sggmail.com
66.90.61.130	A	mail2.mvtservice.com
66.90.62.18	PTR	server.drsmart.com
66.90.62.53	A+PTR	mail.jaorlando.org
66.90.62.56	PTR	node.smartcity.net
66.90.62.67	PTR	node.smartcity.net
66.90.62.122	PTR	node.smartcity.net
66.90.62.131	PTR	node.smartcityon-line.com
66.90.62.218	PTR	mail.dbmginc.com
66.90.62.218	A	mail.dbpgllc.com
66.90.63.4	A	mail.peterstrialgroup.com
66.90.63.12	PTR	node.smartcityon-line.com
66.90.63.12	A	mail1.selkreggtech.com
66.90.63.19	A	*.michaelmjohnson.com
66.90.63.20	A	prangpowerdev.com
66.90.63.21	A	prangpowerdev2.com
66.90.63.30	PTR	mail.strategiscompanies.com
66.90.63.30	A	mail.sellbacktimeshares.com
66.90.63.30	A	mail.timesharebuyback.com
66.90.63.139	PTR	node.smartcityon-line.com
66.90.63.243	PTR	node.smartcityon-line.com
66.90.63.243	A	independentbar.net
66.90.63.243	A	mail.independentbar.net
66.90.63.255	PTR	node.smartcity.net