Robtex

Up: 197.55.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 197.55.144.0/21
Down right: 197.55.152.0/21

IP	Type	Hostname
197.55.145.129	PTR	host-197.55.145.129.tedata.net
197.55.148.4	PTR	host-197.55.148.4.tedata.net
197.55.150.112	PTR	host-197.55.150.112.tedata.net
197.55.152.67	PTR	host-197.55.152.67.tedata.net
197.55.153.17	PTR	host-197.55.153.17.tedata.net
197.55.155.242	PTR	host-197.55.155.242.tedata.net
197.55.156.16	PTR	host-197.55.156.16.tedata.net
197.55.158.19	PTR	host-197.55.158.19.tedata.net
197.55.159.128	PTR	host-197.55.159.128.tedata.net
197.55.159.131	PTR	host-197.55.159.131.tedata.net