Robtex

Up: 72.12.224.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 72.12.240.0/21
Down right: 72.12.248.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.12.240.241	PTR	72-12-240-241.scinternet.net
72.12.242.41	PTR	72-12-242-41.scinternet.net
72.12.242.89	A	surgeelectronics.net
72.12.242.89	A	sorensenelectronics.com
72.12.242.89	A	seimakerspace.com
72.12.242.121	PTR	72-12-242-121.scinternet.net
72.12.242.121	A	mail.pcexpress.us
72.12.242.121	A	mail.phazeco.com
72.12.242.233	PTR	72-12-242-233.scinternet.net
72.12.243.4	PTR	72-12-243-4.scinternet.net
72.12.243.17	PTR	72-12-243-17.scinternet.net
72.12.243.19	PTR	72-12-243-19.scinternet.net
72.12.243.34	PTR	72-12-243-34.scinternet.net
72.12.243.51	PTR	72-12-243-51.scinternet.net
72.12.243.97	PTR	72-12-243-97.scinternet.net
72.12.243.179	PTR	72-12-243-179.scinternet.net
72.12.243.195	PTR	72-12-243-195.scinternet.net
72.12.244.6	A	www.urta.org
72.12.244.6	A	www.bauersrv.com
72.12.244.6	A	accesswest.org
72.12.244.11	A	mail.jeffstarrstudio.com
72.12.244.20	A	verticaladdictions.com
72.12.244.20	A	mail.snowtoyz.com
72.12.244.20	A	atsqueo.com
72.12.244.34	A	www.scbroadband.com
72.12.244.52	A	christmas-festival.org
72.12.244.55	A	www.cedarmountainbuilders.com
72.12.244.55	A	dayswinchesters.com
72.12.244.55	A	cedarmountainbuilders.com
72.12.244.59	A	dayswinchesters.com
72.12.244.70	A	ns1.devurandom.com
72.12.244.71	A	ns2.devurandom.com
72.12.244.72	A	mail.devurandom.com
72.12.244.73	A	robertdalton.com
72.12.244.128	A	daminecraft.com
72.12.245.130	PTR	72-12-245-130.scinternet.net
72.12.245.197	A	ns2.mactech.net
72.12.245.202	A	bradshawchev.com
72.12.245.203	A	ns2.compexchange.com
72.12.245.203	A	ns1.compexchange.com
72.12.247.1	PTR	72-12-247-1.scinternet.net
72.12.247.2	PTR	72-12-247-2.scinternet.net
72.12.247.3	PTR	72-12-247-3.scinternet.net
72.12.247.16	PTR	72-12-247-16.scinternet.net
72.12.247.17	PTR	72-12-247-17.scinternet.net
72.12.247.19	PTR	72-12-247-19.scinternet.net
72.12.247.33	PTR	72-12-247-33.scinternet.net
72.12.247.48	PTR	72-12-247-48.scinternet.net
72.12.247.50	PTR	72-12-247-50.scinternet.net
72.12.247.66	PTR	72-12-247-66.scinternet.net
72.12.247.80	PTR	72-12-247-80.scinternet.net
72.12.247.82	PTR	72-12-247-82.scinternet.net
72.12.247.112	PTR	72-12-247-112.scinternet.net
72.12.247.128	PTR	72-12-247-128.scinternet.net
72.12.247.131	PTR	72-12-247-131.scinternet.net
72.12.247.160	PTR	72-12-247-160.scinternet.net
72.12.247.162	PTR	72-12-247-162.scinternet.net
72.12.247.176	PTR	72-12-247-176.scinternet.net
72.12.247.178	PTR	72-12-247-178.scinternet.net
72.12.247.194	PTR	72-12-247-194.scinternet.net
72.12.247.195	PTR	72-12-247-195.scinternet.net
72.12.247.226	PTR	72-12-247-226.scinternet.net
72.12.247.241	PTR	72-12-247-241.scinternet.net
72.12.248.1	PTR	72-12-248-1.scinternet.net
72.12.248.4	PTR	72-12-248-4.scinternet.net
72.12.248.19	PTR	72-12-248-19.scinternet.net
72.12.248.24	A	thelaneportal.com
72.12.248.29	A	caldaracabin.com
72.12.248.29	A	www.caldaracabin.com
72.12.248.32	PTR	72-12-248-32.scinternet.net
72.12.248.67	PTR	72-12-248-67.scinternet.net
72.12.248.82	PTR	72-12-248-82.scinternet.net
72.12.248.83	PTR	72-12-248-83.scinternet.net
72.12.248.113	PTR	72-12-248-113.scinternet.net
72.12.248.115	PTR	72-12-248-115.scinternet.net
72.12.248.129	PTR	72-12-248-129.scinternet.net
72.12.248.131	PTR	72-12-248-131.scinternet.net
72.12.248.146	PTR	72-12-248-146.scinternet.net
72.12.248.209	PTR	72-12-248-209.scinternet.net
72.12.248.211	PTR	72-12-248-211.scinternet.net
72.12.248.224	PTR	72-12-248-224.scinternet.net
72.12.248.226	PTR	72-12-248-226.scinternet.net
72.12.248.240	PTR	72-12-248-240.scinternet.net
72.12.248.243	PTR	72-12-248-243.scinternet.net
72.12.249.133	PTR	72-12-249-133.scinternet.net
72.12.249.133	A	crwarehousing.ca
72.12.249.178	PTR	72-12-249-178.scinternet.net
72.12.249.178	A	smtpoutbound.pageud.k12.az.us
72.12.249.178	A	pageud.k12.az.us
72.12.249.181	PTR	72-12-249-181.scinternet.net
72.12.249.181	A	ps.pageud.k12.az.us
72.12.249.183	PTR	72-12-249-183.scinternet.net
72.12.249.183	A	mail.pageud.k12.az.us
72.12.250.10	A+PTR	ns2.scinternet.net
72.12.250.17	PTR	72-12-250-17.scinternet.net
72.12.250.17	A	www.scbroadband.com
72.12.250.17	A	www.scinternet.net
72.12.250.25	PTR	72-12-250-25.scinternet.net
72.12.250.31	PTR	72-12-250-31.scinternet.net
72.12.250.33	PTR	72-12-250-33.scinternet.net
72.12.250.33	A	www.scinternet.net
72.12.250.33	A	123inter.net
72.12.251.43	PTR	72-12-251-43.scinternet.net
72.12.251.43	A	ccwwplant.com
72.12.251.142	PTR	72-12-251-142.scinternet.net
72.12.251.142	A	craftdirect.com
72.12.251.202	PTR	72-12-251-202.scinternet.net
72.12.252.1	PTR	72-12-252-1.scinternet.net
72.12.252.4	A	www.sbsu.org
72.12.252.4	A	sbsu.net
72.12.252.4	A	www.sbsu.com
72.12.252.178	PTR	72-12-252-178.scinternet.net
72.12.252.218	A	wiprint.com
72.12.252.218	A	dynapress.com
72.12.252.218	A	mail.hildale.com
72.12.253.3	PTR	72-12-253-3.scinternet.net
72.12.253.32	PTR	72-12-253-32.scinternet.net
72.12.253.33	PTR	72-12-253-33.scinternet.net
72.12.253.34	PTR	72-12-253-34.scinternet.net
72.12.253.65	PTR	72-12-253-65.scinternet.net
72.12.253.66	PTR	72-12-253-66.scinternet.net
72.12.253.80	PTR	72-12-253-80.scinternet.net
72.12.253.81	PTR	72-12-253-81.scinternet.net
72.12.253.82	PTR	72-12-253-82.scinternet.net
72.12.253.98	PTR	72-12-253-98.scinternet.net
72.12.253.130	PTR	72-12-253-130.scinternet.net
72.12.253.131	PTR	72-12-253-131.scinternet.net
72.12.253.146	PTR	72-12-253-146.scinternet.net
72.12.253.179	PTR	72-12-253-179.scinternet.net
72.12.253.195	PTR	72-12-253-195.scinternet.net
72.12.253.224	PTR	72-12-253-224.scinternet.net
72.12.253.240	PTR	72-12-253-240.scinternet.net
72.12.253.242	PTR	72-12-253-242.scinternet.net
72.12.254.108	A	funny-fenns.com