Robtex

Up: 216.70.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.70.28.0/25
Down right: 216.70.28.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.70.28.2	PTR	mail.ikonics.com
216.70.28.2	A	mail.ikonicsmms.com
216.70.28.2	A	mail.ikonicsiis.com
216.70.28.6	A	ikonicsftp.com
216.70.28.34	PTR	mail.customerlinkone.com
216.70.28.34	A	firewall.customerlinkone.com
216.70.28.35	A	youthperformancecompany.org
216.70.28.36	A+PTR	mail.customerlinkone.com
216.70.28.41	A+PTR	zmail.customerlinkone.com
216.70.28.77	PTR	h216.70.28.77.superiorbroadband.com
216.70.28.86	A	b.mx.mx3.com
216.70.28.178	A	mail.duluthinjurylawyers.com
216.70.28.197	A+PTR	antispam.kbjr.com
216.70.28.234	PTR	mail.theduluthmodel.org