Robtex

Up: 199.59.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 199.59.36.0/24
Down right: 199.59.37.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
199.59.36.31	A+PTR	mobile.heb.com
199.59.36.44	A+PTR	ucrp.heb.com
199.59.36.66	A+PTR	eappshrtst1.heb.com
199.59.36.66	A+PTR	partnerselfservicec01.heb.com
199.59.36.66	A+PTR	partnerselfservicec03.heb.com
199.59.37.22	A+PTR	mx30.heb.com
199.59.37.53	A	mx35.heb.com
199.59.37.80	A+PTR	ns3.heb.com