Robtex

Up: 163.230.252.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 163.230.254.0/24
Down right: 163.230.255.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
163.230.254.11	PTR	apps2.sentara.com
163.230.254.11	PTR	blogsstaging.sentara.com
163.230.254.11	A+PTR	clearquest.sentara.com
163.230.254.200	PTR	sentara.com
163.230.254.200	PTR	sentara.org
163.230.254.200	A+PTR	ns1.sentara.com
163.230.254.202	PTR	www.sentara.com
163.230.254.204	A+PTR	ns2.sentara.com
163.230.254.206	A	sentara.sentara.com
163.230.254.206	A	ns1.sentara.com
163.230.254.209	A	sdcnts40.optimabehavioralhealth.com
163.230.254.214	A+PTR	xertspam01.optimahealth.net
163.230.254.214	A+PTR	xertspam01.sentara.net
163.230.254.235	A+PTR	ftp.sentara.com
163.230.254.244	A+PTR	spamnet.sentara.com
163.230.254.244	A	mail1.rhcc.com
163.230.254.244	A	notify.rhcc.com
163.230.254.245	PTR	spamnet2.sentara.com
163.230.254.245	A	mail2.rhcc.com
163.230.255.31	A+PTR	indimso02.sentara.com
163.230.255.32	A+PTR	indimsi01.sentara.com
163.230.255.32	A	mail1.rhcc.com
163.230.255.32	A	notify.rhcc.com
163.230.255.33	PTR	indimsi02.sentara.com
163.230.255.33	A	mail2.rhcc.com
163.230.255.34	A+PTR	indimsi03.sentara.com
163.230.255.35	A+PTR	indimsi04.sentara.com
163.230.255.36	A+PTR	indimsi05.sentara.com
163.230.255.37	A+PTR	indimsi06.sentara.com