Robtex

Up: 72.1.70.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 72.1.71.0/25
Down right: 72.1.71.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.1.71.21	PTR	21.71.1.72.host.smoothstone.net
72.1.71.57	PTR	57.71.1.72.host.smoothstone.net
72.1.71.57	A	ns3.homeloancenter.com
72.1.71.96	PTR	mail.mennonites.org
72.1.71.99	PTR	99.71.1.72.host.smoothstone.net
72.1.71.99	A	journeytowardforgiveness.com
72.1.71.99	A	longroadback.com
72.1.71.102	A	radicaljourney.org
72.1.71.104	PTR	104.71.1.72.host.smoothstone.net
72.1.71.106	A	mennodata.org
72.1.71.111	A	www.mennoniteeducation.org
72.1.71.112	PTR	112.71.1.72.host.smoothstone.net
72.1.71.114	PTR	114.71.1.72.host.smoothstone.net
72.1.71.130	PTR	mail.idi.com
72.1.71.131	PTR	131.71.1.72.host.smoothstone.net
72.1.71.132	A+PTR	idiwww1.idi.com
72.1.71.137	A	smtp.idi.com
72.1.71.139	PTR	139.71.1.72.host.smoothstone.net
72.1.71.140	A	access.idi.com
72.1.71.147	PTR	147.71.1.72.host.smoothstone.net
72.1.71.147	A	mail.idi.com
72.1.71.151	A+PTR	mail1.idi.com
72.1.71.152	A	mail2.idi.com
72.1.71.157	PTR	157.71.1.72.host.smoothstone.net
72.1.71.164	PTR	164.71.1.72.host.smoothstone.net
72.1.71.176	PTR	176.71.1.72.host.smoothstone.net
72.1.71.193	PTR	www.thetravelteam.com
72.1.71.193	A	thetravelteamleisure.com
72.1.71.193	A	nfttravel.com
72.1.71.194	PTR	194.71.1.72.host.smoothstone.net
72.1.71.194	A	alternativetravelsolutions.com
72.1.71.196	A	discoverits.com
72.1.71.198	A	app01.thetravelteam.com
72.1.71.201	PTR	201.71.1.72.host.smoothstone.net
72.1.71.201	A	mail.nfttravel.com
72.1.71.201	A	bsf.thetravelteam.com
72.1.71.203	A	mail.thetravelteam.com
72.1.71.206	PTR	206.71.1.72.host.smoothstone.net
72.1.71.227	PTR	227.71.1.72.host.smoothstone.net
72.1.71.236	PTR	236.71.1.72.host.smoothstone.net
72.1.71.239	PTR	239.71.1.72.host.smoothstone.net
72.1.71.246	PTR	246.71.1.72.host.smoothstone.net
72.1.71.251	PTR	251.71.1.72.host.smoothstone.net