Robtex

Up: 197.56.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 197.56.0.0/17
Down right: 197.56.128.0/17

IP	Type	Hostname
197.56.0.0	PTR	host-197.56.0.0.tedata.net
197.56.1.191	PTR	host-197.56.1.191.tedata.net
197.56.35.75	PTR	host-197.56.35.75.tedata.net
197.56.50.43	PTR	host-197.56.50.43.tedata.net
197.56.109.8	PTR	host-197.56.109.8.tedata.net
197.56.209.203	PTR	host-197.56.209.203.tedata.net