Robtex

Up: 158.72.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 158.72.64.0/23
Down right: 158.72.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
158.72.64.10	A+PTR	helios.psc.gov
158.72.64.10	A+PTR	newhelios.psc.gov
158.72.64.11	A+PTR	helios.psc.gov
158.72.64.20	A+PTR	juno.psc.gov
158.72.64.58	A+PTR	dcis01.psc.gov
158.72.64.59	A+PTR	dcis02.psc.gov
158.72.64.67	A+PTR	dcis03.psc.gov
158.72.64.68	A+PTR	dcis04.psc.gov
158.72.64.69	A	dcis05.psc.gov
158.72.64.70	A	dcis06.psc.gov
158.72.64.71	A	dcis07.psc.gov
158.72.65.195	A+PTR	briar.usphs.gov
158.72.65.196	A+PTR	aspen.usphs.gov
158.72.65.200	PTR	dev.usphs.gov
158.72.65.200	A+PTR	dcp.psc.gov
158.72.65.200	A	usphs.gov
158.72.65.219	A	juno.psc.gov