Robtex

Up: 212.11.72.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 212.11.72.0/23
Down right: 212.11.74.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
212.11.72.1	PTR	no-reverse-dns-set.gradwell.com
212.11.72.63	PTR	no-reverse-dns-set.gradwell.com
212.11.72.72	A+PTR	debweb-2.web.thdo.gradwell.com
212.11.72.112	PTR	no-reverse-dns-set.gradwell.com
212.11.72.131	PTR	no-reverse-dns-set.gradwell.com
212.11.72.231	PTR	no-reverse-dns-set.gradwell.com
212.11.73.10	PTR	www.gradwell.com
212.11.73.11	PTR	www.gradwell.net
212.11.73.18	PTR	hosting.gradwell.com
212.11.73.18	A	www.gradwell.net
212.11.73.18	A	gradwell.net.uk
212.11.73.28	PTR	webmail-staging.gradwell.com
212.11.73.28	A	*.www.gradwell.com
212.11.73.29	A	*.www.gradwell.it
212.11.73.29	A	net.www.gradwell.net
212.11.73.127	PTR	broadcast-vlan2502.gradwell.com
212.11.73.128	PTR	unassigned.gradwell.net
212.11.73.139	PTR	unassigned.gradwell.net
212.11.73.226	A	corp-web-1.gradwell.com
212.11.73.232	A	app-live-53-1.gradwell.com
212.11.73.252	PTR	app-live-2.web.thdo.gradwell.net
212.11.74.199	PTR	no-reverse-dns-set.gradwell.com
212.11.75.5	PTR	no-reverse-dns-set.gradwell.com
212.11.75.5	A	lovelock.co.uk
212.11.75.5	A	wellness-sam.com
212.11.75.6	PTR	no-reverse-dns-set.gradwell.com
212.11.75.8	A	www.shiresmt.com
212.11.75.9	A	tkitcloud.co.uk
212.11.75.9	A	www.tkitcloud.co.uk
212.11.75.11	PTR	no-reverse-dns-set.gradwell.com
212.11.75.11	A	websitemango.co.uk
212.11.75.13	A	livingrainforest.org
212.11.75.13	A	www.livingrainforest.org
212.11.75.13	A	livingrainforest.co.uk
212.11.75.19	PTR	no-reverse-dns-set.gradwell.com
212.11.75.21	PTR	no-reverse-dns-set.gradwell.com
212.11.75.21	A	gradwellcloud.com
212.11.75.21	A	www.gradwellcloud.com
212.11.75.24	A	locallcloud.net
212.11.75.25	PTR	no-reverse-dns-set.gradwell.com
212.11.75.25	A	lewandowski.org.uk
212.11.75.223	PTR	no-reverse-dns-set.gradwell.com