Robtex

Up: 198.36.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 198.36.36.0/24
Down right: 198.36.37.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.36.37.4	PTR	smtp4.aramco.com
198.36.37.5	PTR	smtp6.aramco.com
198.36.37.5	PTR	xmpp.aramco.com
198.36.37.5	A	sip.aramco.com
198.36.37.6	PTR	smtp5.aramco.com
198.36.37.7	PTR	smtp6.aramco.com
198.36.37.16	PTR	smtp2.aramco.com
198.36.37.16	A+PTR	smtp2.aramcoretiree.com
198.36.37.16	PTR	smtp2.aramcotech.com
198.36.37.17	PTR	smtp1.aramco.com
198.36.37.17	PTR	smtp1.aramcoretiree.com
198.36.37.17	PTR	smtp1.aramcotech.com
198.36.37.18	PTR	smtp3.aramco.com
198.36.37.18	A+PTR	smtp3.aramcoretiree.com
198.36.37.18	PTR	smtp3.aramcotech.com
198.36.37.19	PTR	smtp4.aramco.com
198.36.37.19	PTR	smtp4.aramcoretiree.com
198.36.37.19	PTR	smtp4.aramcotech.com
198.36.37.24	A+PTR	connect.aramco.com
198.36.37.39	A+PTR	smtp1.aramcotrading.com
198.36.37.40	A+PTR	smtp2.aramcotrading.com