Robtex

Up: 170.138.0.0/15
Can't show all results, try to descend to a more specific CIDR
Down left: 170.139.0.0/17
Down right: 170.139.128.0/17
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.139.235.240	A+PTR	mailhost.firstcarolinacare.com
170.139.235.240	A+PTR	mailhost.hncpartnership.org
170.139.235.240	A+PTR	mailhost.firsthealth.org
170.139.235.241	PTR	securemail.firstcarolinacare.com
170.139.235.241	PTR	securemail.healthncplus.org
170.139.235.241	PTR	securemail.firsthealth.org
170.139.240.10	A	ns2-fhc.firsthealth.org
170.139.240.11	A	ns3-fhc.firsthealth.org
170.139.240.16	A+PTR	iport1.fhpg.org
170.139.240.16	PTR	iport1.firsthealth.org
170.139.240.16	A	iport1.firstcarolinacare.com
170.139.240.17	PTR	iport2.fhpg.org
170.139.240.17	PTR	iport2.firsthealth.org
170.139.252.5	A	vdns1.firsthealth.org
170.139.252.252	A	loadbalancer.firsthealth.org