Robtex

Up: 197.39.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 197.39.128.0/18
Down right: 197.39.192.0/18
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
197.39.137.159	PTR	host-197.39.137.159.tedata.net
197.39.142.140	PTR	host-197.39.142.140.tedata.net
197.39.144.243	PTR	host-197.39.144.243.tedata.net
197.39.146.13	PTR	host-197.39.146.13.tedata.net
197.39.148.245	PTR	host-197.39.148.245.tedata.net
197.39.148.245	A	online.dnset.com
197.39.151.122	PTR	host-197.39.151.122.tedata.net
197.39.151.122	A	ns3.frowcmx.us
197.39.151.122	A	ns2.frowcmx.us
197.39.160.233	PTR	host-197.39.160.233.tedata.net
197.39.163.25	PTR	host-197.39.163.25.tedata.net
197.39.163.162	PTR	host-197.39.163.162.tedata.net
197.39.163.187	PTR	host-197.39.163.187.tedata.net
197.39.163.200	PTR	host-197.39.163.200.tedata.net
197.39.165.188	PTR	host-197.39.165.188.tedata.net
197.39.168.29	PTR	host-197.39.168.29.tedata.net
197.39.177.68	PTR	host-197.39.177.68.tedata.net
197.39.179.175	PTR	host-197.39.179.175.tedata.net
197.39.179.180	PTR	host-197.39.179.180.tedata.net
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
197.39.225.94	PTR	host-197.39.225.94.tedata.net
197.39.226.84	PTR	host-197.39.226.84.tedata.net
197.39.228.150	PTR	host-197.39.228.150.tedata.net
197.39.229.140	PTR	host-197.39.229.140.tedata.net
197.39.235.222	PTR	host-197.39.235.222.tedata.net
197.39.238.50	PTR	host-197.39.238.50.tedata.net
197.39.239.110	PTR	host-197.39.239.110.tedata.net
197.39.244.49	PTR	host-197.39.244.49.tedata.net
197.39.246.218	PTR	host-197.39.246.218.tedata.net
197.39.252.22	PTR	host-197.39.252.22.tedata.net
197.39.252.34	A	rootssh.tk
197.39.255.255	PTR	host-197.39.255.255.tedata.net