Robtex

Up: 216.83.162.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.83.163.0/25
Down right: 216.83.163.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.83.163.132	PTR	mailrelay.mycmsc.com
216.83.163.139	PTR	mail.sierrasystems.com
216.83.163.140	PTR	support.crestone.com
216.83.163.140	A	owa.sierrasystems.com
216.83.163.141	PTR	crestone.com
216.83.163.141	PTR	staffpak.com
216.83.163.141	PTR	www.staffpak.com
216.83.163.142	PTR	mycmsc.com
216.83.163.143	A+PTR	ns3.mycmsc.com
216.83.163.145	A+PTR	ns1.mycmsc.com
216.83.163.145	A	ns1.apiscenter.com
216.83.163.147	A	owa.cedarcrestone.com
216.83.163.149	PTR	mail2.sierrasystems.com
216.83.163.150	PTR	sftp.mycmsc.com
216.83.163.157	A	mail1.adrenalineresources.com
216.83.163.157	A	mailgw1.itserveco.com
216.83.163.157	A	mail.sierra-cedar.com
216.83.163.158	A	mail1.adrenalineresources.com
216.83.163.158	A	mail.sierra-cedar.com
216.83.163.158	A	mail.analyticvision.com