Robtex

Up: 66.90.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 66.90.16.0/21
Down right: 66.90.24.0/21

IP	Type	Hostname
66.90.16.51	PTR	node.smartcity.net
66.90.16.64	PTR	node.smartcity.net
66.90.16.113	PTR	node.smartcity.net
66.90.16.115	PTR	node.smartcity.net
66.90.16.178	PTR	node.smartcity.net
66.90.21.30	PTR	node.smartcity.net
66.90.23.65	PTR	scscontwifi65.smartcity.net
66.90.26.50	PTR	node.smartcity.net
66.90.26.227	PTR	node.smartcity.net
66.90.27.50	PTR	node.smartcityon-line.com
66.90.27.98	PTR	node.smartcityon-line.com
66.90.29.129	PTR	node.smartcity.net
66.90.30.32	PTR	node.smartcity.net
66.90.31.34	PTR	node.smartcity.net