Robtex

Up: 197.39.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 197.39.0.0/20
Down right: 197.39.16.0/20

IP	Type	Hostname
197.39.0.0	PTR	host-197.39.0.0.tedata.net
197.39.13.52	PTR	host-197.39.13.52.tedata.net
197.39.14.2	PTR	host-197.39.14.2.tedata.net
197.39.16.2	PTR	host-197.39.16.2.tedata.net
197.39.19.81	PTR	host-197.39.19.81.tedata.net
197.39.20.2	PTR	host-197.39.20.2.tedata.net
197.39.23.190	PTR	host-197.39.23.190.tedata.net
197.39.24.2	PTR	host-197.39.24.2.tedata.net