Robtex

Up: 198.245.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 198.245.32.0/22
Down right: 198.245.36.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
198.245.32.14	A+PTR	mailhost.wellmark.com
198.245.32.14	A+PTR	mailsvr1.wellmark.com
198.245.32.15	A+PTR	xdsmftp01.wellmark.com
198.245.32.16	A+PTR	zixvpm.firstadministrators.com
198.245.32.16	A+PTR	xdsmhost1.wellmark.com
198.245.32.16	A+PTR	zixvpm.wellmark.com
198.245.32.17	A	mailhost.wellmark.com
198.245.32.26	PTR	mailhost.firstadministratorstest.com
198.245.32.26	A+PTR	xdsmhost2.firstadministratorstest.com
198.245.32.26	A+PTR	mailhost.wellmarktest.com
198.245.32.45	A+PTR	xdsmhost2.firstadministrators.com
198.245.32.45	A+PTR	xdsmhost2.wellmark.com
198.245.32.52	A+PTR	zixvpm.firstadministrators.com
198.245.32.52	A+PTR	xdsmhost.wellmark.com
198.245.32.52	A+PTR	zixvpm.wellmark.com
198.245.32.56	A+PTR	xdsmhost.firstadministrators.com
198.245.32.60	A	dsmdns02.wellmark.com
198.245.32.76	A+PTR	afts.wellmark.com
198.245.32.159	A+PTR	dsm-dmz-f5-01-a-gtm.wellmark.com
198.245.32.160	A+PTR	mobileiron.wellmark.com
198.245.32.169	A+PTR	dsm-dmz-f5-02-a-gtm.wellmark.com
198.245.32.242	A	faabenefits.com
198.245.34.22	PTR	vanity.wellmark.com
198.245.34.22	A	whatmattersbywellmark.com
198.245.34.22	A	wellmarkthreepointplay.com
198.245.34.101	A+PTR	services.wellmark.com
198.245.34.201	A+PTR	wellmark.com
198.245.34.201	A+PTR	bluepriority.wellmark.com
198.245.34.201	A+PTR	www.wellmark.com
198.245.34.202	PTR	board.wellmark.com
198.245.34.202	PTR	board2.wellmark.com
198.245.34.203	PTR	ebusiness.wellmark.com
198.245.34.203	PTR	ebusiness2.wellmark.com
198.245.34.204	PTR	welcome.wellmark.com
198.245.34.204	PTR	welcome2.wellmark.com
198.245.37.159	A	alt-dmz-f5-01-a-gtm.wellmark.com