Robtex

Up: 72.2.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.2.44.0/23
Down right: 72.2.46.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.2.44.3	PTR	h72-2-44-3.bigpipeinc.com
72.2.44.3	A	ns2.dockmaster.net
72.2.44.3	A	orenda.dockmaster.net
72.2.44.4	PTR	h72-2-44-4.bigpipeinc.com
72.2.44.4	A	dockmaster.net
72.2.44.4	A	mail.dockmaster.net
72.2.44.11	PTR	h72-2-44-11.bigpipeinc.com
72.2.44.11	A	weinberger.ca
72.2.44.11	A	pvvn.com
72.2.44.23	PTR	h72-2-44-23.bigpipeinc.com
72.2.44.45	PTR	h72-2-44-45.bigpipeinc.com
72.2.44.46	PTR	h72-2-44-46.bigpipeinc.com
72.2.44.53	PTR	h72-2-44-53.bigpipeinc.com
72.2.44.73	PTR	h72-2-44-73.bigpipeinc.com
72.2.44.76	PTR	h72-2-44-76.bigpipeinc.com
72.2.44.78	PTR	h72-2-44-78.bigpipeinc.com
72.2.44.90	PTR	h72-2-44-90.bigpipeinc.com
72.2.44.150	PTR	h72-2-44-150.bigpipeinc.com
72.2.44.178	PTR	h72-2-44-178.bigpipeinc.com
72.2.44.182	PTR	h72-2-44-182.bigpipeinc.com
72.2.44.192	A	mail.cherishdirect.com
72.2.45.194	PTR	h72-2-45-194.bigpipeinc.com
72.2.45.194	A	burnard.com
72.2.46.1	A+PTR	outtie.microserve.ca
72.2.46.2	PTR	mail.microserve.ca
72.2.46.3	A	mail.microserve.ca
72.2.46.4	PTR	creste.microserve.ca
72.2.46.5	A+PTR	term.microserve.ca
72.2.46.5	A	creste.microserve.ca
72.2.46.21	A	cwreports.microserve.ca
72.2.46.25	A	connect.microserve.ca
72.2.46.26	A	autodiscover.microserve.ca
72.2.46.26	A	webmail.microserve.ca
72.2.46.71	A	intranet.microserve.ca
72.2.46.72	A+PTR	cms.microserve.ca
72.2.46.77	A	reports.microserve.ca
72.2.46.78	A	shiplink.microserve.ca
72.2.46.155	A	mail.microservelab.ca
72.2.46.192	PTR	boknowshockey.com
72.2.46.194	A	bwchockey.com
72.2.46.199	A	theurbangarage.com
72.2.46.200	PTR	www.vancouverselects.com
72.2.46.201	PTR	www.vancouversportscamp.ca
72.2.47.14	A	lync.microserve.ca
72.2.47.21	A	lyncaccess.microserve.ca