Robtex

Up: 216.201.228.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 216.201.230.0/24
Down right: 216.201.231.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.201.230.98	A+PTR	mail.wpw1.com
216.201.230.186	PTR	mail.closinghouse.com
216.201.230.186	A	*.closinghouse.net
216.201.230.226	PTR	ftp.mjsheridan.com
216.201.230.226	PTR	mail.mjsheridan.com
216.201.230.228	A	mail.mjsheridan.com
216.201.230.230	A	ftp.mjsheridan.com
216.201.230.236	A+PTR	mx.masterduct.com
216.201.230.242	A	host126.txpetinv.com
216.201.230.242	A	host115.txpetinv.com
216.201.230.242	A	host103.txpetinv.com
216.201.230.244	A	mx.txpetinv.com
216.201.230.245	A	mail.txpetinv.com
216.201.231.122	PTR	mail.ubahouston.org
216.201.231.124	A	mail.ensingerspi.com
216.201.231.138	PTR	dopmail.digitalofficeporducts.com
216.201.231.138	A	zenodigitalsolutions.com
216.201.231.164	PTR	webmail.fitchlaw.com
216.201.231.222	A	mail.cssare.com
216.201.231.222	A	mail.thespineandsportscenter.com