Robtex

Up: 208.89.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.89.16.0/23
Down right: 208.89.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.89.16.51	A+PTR	anywheremip.uhstx.com
208.89.16.63	A+PTR	secmail3.uhstx.com
208.89.16.66	A+PTR	aixidx.uhstx.com
208.89.16.67	A	webmail.uhstx.com
208.89.16.72	A+PTR	mail.uhstx.com
208.89.16.72	A	mail.uhs-sa.com
208.89.16.74	PTR	universityhealthsystem.com
208.89.16.74	A	www.uhstx.com
208.89.16.74	A	theuniversitydifference.com
208.89.16.84	A+PTR	labs-sec.uhstx.com
208.89.16.84	A	labs.uhstx.com
208.89.16.85	A+PTR	encrypt.uhstx.com
208.89.16.87	PTR	patientonline.universityhealthsystem.com
208.89.16.87	A	myuhs.com
208.89.16.125	A+PTR	uhsemr.uhstx.com
208.89.16.127	PTR	synapsecv.uhstx.com
208.89.16.136	A+PTR	legacy.uhstx.com
208.89.16.138	A+PTR	transfer.uhstx.com
208.89.16.140	PTR	test.uhstx.com
208.89.16.140	A	mail2.uhstx.com
208.89.16.141	A+PTR	securemail.uhstx.com
208.89.19.41	A	www.universityhealthsystem.com
208.89.19.41	A	universitychildrenshealth.com
208.89.19.43	A	synapsecv.uhstx.com
208.89.19.89	A	ns2.warl0rd.net