Robtex

Up: 193.133.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 193.133.0.0/21
Down right: 193.133.8.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
193.133.0.103	PTR	emta.emta.org.uk
193.133.3.114	PTR	jove-e.qsp.co.uk
193.133.12.195	PTR	mail.roger-bullivant.co.uk
193.133.12.195	A	mail.geothermal-uk.com
193.133.12.195	A	mail.system-first.net
193.133.13.142	A	pipex-gw.prqa.co.uk