Robtex

Up: 72.53.160.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 72.53.176.0/21
Down right: 72.53.184.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.53.176.0	PTR	0-176-53-72.esc7.net
72.53.176.55	A	exch.esc7.net
72.53.177.0	PTR	0-177-53-72.esc7.net
72.53.177.51	PTR	51-177-53-72.esc7.net
72.53.177.67	PTR	67-177-53-72.esc7.net
72.53.177.97	PTR	97-177-53-72.esc7.net
72.53.177.130	PTR	exch.esc7.net
72.53.177.144	PTR	webserv0.esc7.net
72.53.177.145	PTR	webserv0.esc7.net
72.53.177.146	PTR	mail.lanevilleisd.org
72.53.177.147	PTR	mail.alto.esc7.net
72.53.177.155	A	mail.esc7.net
72.53.177.161	PTR	mail.gsisd.esc7.net
72.53.177.176	PTR	mail.sabine.esc7.net
72.53.177.179	PTR	mail.slocum.esc7.net
72.53.177.185	A	mail.trinidadisd.com
72.53.177.189	A	stage.dmac-solutions.com
72.53.177.191	A	support.esc7.net
72.53.177.192	PTR	store.esc7.net
72.53.177.240	PTR	240-177-53-72.esc7.net
72.53.178.113	PTR	113-178-53-72.esc7.net
72.53.178.119	A	cayugaisd.com
72.53.179.129	PTR	129-179-53-72.esc7.net
72.53.179.131	A	mail.leverettschapelisd.net
72.53.179.177	A	ls.martinsmillisd.net
72.53.179.185	A	barracuda.martinsmillisd.net
72.53.180.19	A	mail.overtonisd.net
72.53.180.21	A	filter.overtonisd.net
72.53.180.133	A	spamgate.trinidadisd.com
72.53.181.6	PTR	ns2.esc13.net
72.53.182.2	A+PTR	ubuntu-mail.bullardisd.net
72.53.182.3	PTR	3-182-53-72.esc7.net
72.53.182.5	PTR	bullardisd.net
72.53.182.5	A	mail.bullardisd.net
72.53.182.13	A	ubuntu-lb1.bullardisd.net
72.53.182.21	PTR	21-182-53-72.esc7.net
72.53.182.22	PTR	22-182-53-72.esc7.net
72.53.182.28	PTR	28-182-53-72.esc7.net
72.53.182.35	A	gradespeed.lapoynorisd.net
72.53.182.36	A	helpdesk.lapoynorisd.net
72.53.182.39	A	jrhigh.lapoynorisd.net
72.53.182.40	A	highschool.lapoynorisd.net
72.53.182.48	PTR	48-182-53-72.esc7.net
72.53.182.48	A	lapoynorisd.net
72.53.182.65	PTR	65-182-53-72.esc7.net
72.53.182.65	A	gradespeed.sabine.esc7.net
72.53.182.67	A	sisdsql.sabine.esc7.net
72.53.182.88	PTR	88-182-53-72.esc7.net
72.53.182.120	PTR	120-182-53-72.esc7.net
72.53.182.132	A	high-school.cushingisd.org
72.53.182.133	A	busbarn.cushingisd.org
72.53.182.135	A	elem.cushingisd.org
72.53.182.164	A	escweb.esc7.net
72.53.182.170	PTR	170-182-53-72.esc7.net
72.53.182.185	A	info.esc7.net
72.53.182.186	A+PTR	listserv.esc7.net
72.53.182.188	A	dmacdns2.dmac-solutions.net
72.53.185.5	A	workshops.esc7.net
72.53.185.65	PTR	65-185-53-72.esc7.net
72.53.185.68	A	mail.ptisd.org
72.53.185.68	A	classroom.ptisd.org
72.53.185.68	A	*.ptisd.org
72.53.185.82	PTR	82-185-53-72.esc7.net
72.53.186.10	A	ns1.esc7.net
72.53.186.11	A	ns2.esc7.net
72.53.186.12	A	ns3.esc7.net
72.53.186.13	A	ns0.esc7.net
72.53.186.20	A	mx0.esc7.net
72.53.186.21	A	mx1.esc7.net
72.53.186.22	A	mx2.esc7.net
72.53.186.23	A	mx3.esc7.net
72.53.186.50	A+PTR	rmx0.esc7.net
72.53.186.50	A	mxquad.esc7.net
72.53.186.51	A+PTR	rmx1.esc7.net
72.53.186.51	A	mxquad.esc7.net
72.53.186.52	A	mxquad.esc7.net
72.53.186.52	A	rmx2.esc7.net
72.53.186.53	A	mxquad.esc7.net
72.53.186.54	A	mxquad.esc7.net
72.53.190.2	A+PTR	mx0.esc7.net
72.53.190.3	A+PTR	mx1.esc7.net
72.53.190.4	A	mx2.esc7.net
72.53.190.5	A	mx3.esc7.net
72.53.190.91	A	scheduler.esc7.net
72.53.191.5	A	karnackisd.org
72.53.191.5	A	upload.esc7.net
72.53.191.7	A	media.esc7.net
72.53.191.10	A	mirror.esc7.net
72.53.191.14	A	excelsior.esc7.net
72.53.191.21	A	mail.westrusk.esc7.net
72.53.191.21	A	bmail.esc7.net
72.53.191.21	A	mail.hemphill.esc7.net
72.53.191.231	A	admin.esc7.net