Robtex

Up: 194.70.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 194.70.4.0/23
Down right: 194.70.6.0/23

IP	Type	Hostname
194.70.4.8	PTR	poirot.clues.com
194.70.4.9	PTR	rockcliffe.clues.com
194.70.4.18	PTR	ns0.drav.net
194.70.4.19	PTR	spark.b0rk.co.uk
194.70.4.88	PTR	no-dns-yet.demon.co.uk
194.70.5.62	PTR	no-dns-yet.demon.co.uk