Robtex

Up: 158.72.0.0/16
Can't show all results, try to descend to a more specific CIDR
Down left: 158.72.128.0/18
Down right: 158.72.192.0/18

IP	Type	Hostname
158.72.139.19	A+PTR	smtp.ees.hhs.gov
158.72.139.19	A	smtp.hhs.gov
158.72.139.20	PTR	owa.hhs.gov
158.72.139.23	A	autodiscover.hhs.gov
158.72.139.58	A	smtp01.ees.hhs.gov
158.72.147.27	A	rates.psc.gov
158.72.175.3	A	fa0-0.usdepartmentofhealt2.bbnplanet.net
158.72.175.3	A	usdepartmentofhealt2.bbnplanet.net