Robtex

Up: 80.73.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 80.73.248.0/22
Down right: 80.73.252.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
80.73.248.34	A	mail.catchastudent.com
80.73.248.34	A	catchastudent.com
80.73.248.68	A	pornofuehrer.de
80.73.248.68	A	6finder.eu
80.73.248.68	A	pornofuehrer.eu
80.73.248.69	PTR	host-80-73-248-69.essensys.co.uk
80.73.248.222	PTR	host-80-73-248-222.essensys.co.uk
80.73.248.224	PTR	host-80-73-248-224.essensys.co.uk
80.73.249.22	A	mailserver.bureauwages.com
80.73.249.26	A	cubitech.org
80.73.249.106	A	mail.vale-retail.com
80.73.249.174	PTR	host-80-73-249-174.essensys.co.uk
80.73.249.174	A	barracudamobile.co.uk
80.73.249.242	A+PTR	mailserver.matrixlegalsupport.co.uk
80.73.250.93	PTR	host-80-73-250-93.essensys.co.uk
80.73.250.132	PTR	host-80-73-250-132.essensys.co.uk
80.73.250.132	A	hallhire.gotdns.com
80.73.250.213	PTR	host-80-73-250-213.essensys.co.uk
80.73.250.213	A	nts1.moex.co.uk
80.73.250.218	PTR	mail.futurenova.com
80.73.250.218	A	extmail.futurenova.com
80.73.250.234	PTR	host-80-73-250-234.essensys.co.uk
80.73.251.10	PTR	host-80-73-251-10.essensys.co.uk
80.73.251.10	A	phineasremote.com
80.73.251.162	A+PTR	mail.rasinifairway.com
80.73.252.83	PTR	host-80-73-252-83.essensys.co.uk
80.73.252.83	A	mail.tavistock.co.uk
80.73.252.172	PTR	host-80-73-252-172.essensys.co.uk
80.73.253.46	PTR	host-80-73-253-46.essensys.co.uk
80.73.253.46	A	mail.strategic-dimensions.co.uk
80.73.253.194	PTR	host-80-73-253-194.essensys.co.uk
80.73.253.198	PTR	host-80-73-253-198.essensys.co.uk
80.73.253.198	A	alpha.public.enovate.co.uk
80.73.253.234	PTR	mail.wrather.co.uk
80.73.253.234	A	remote.wrather.co.uk