Robtex

Up: 197.39.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 197.39.192.0/20
Down right: 197.39.208.0/20

IP	Type	Hostname
197.39.192.54	PTR	host-197.39.192.54.tedata.net
197.39.192.105	PTR	host-197.39.192.105.tedata.net
197.39.198.177	PTR	host-197.39.198.177.tedata.net
197.39.209.187	PTR	host-197.39.209.187.tedata.net
197.39.210.120	PTR	host-197.39.210.120.tedata.net
197.39.211.53	PTR	host-197.39.211.53.tedata.net
197.39.215.13	PTR	host-197.39.215.13.tedata.net