Robtex

Up: 216.23.232.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 216.23.233.0/25
Down right: 216.23.233.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
216.23.233.38	PTR	ragingbull.com
216.23.233.38	PTR	ip233-38.esignal.com
216.23.233.40	PTR	ip233-40.esignal.com
216.23.233.40	A	fsxtra.com
216.23.233.40	A	xtra.esignal.biz
216.23.233.50	PTR	ip233-50.esignal.com
216.23.233.91	PTR	ip233-91.esignal.com
216.23.233.91	A	lookup.gtm.esignal.com
216.23.233.91	A	lookup.esignal.com
216.23.233.169	A+PTR	mail.bondedge.com
216.23.233.170	PTR	ip233-170.esignal.com
216.23.233.187	PTR	ip233-187.esignal.com
216.23.233.200	PTR	cm-star.esignal.biz
216.23.233.200	A+PTR	cm2.esignal.biz
216.23.233.200	PTR	cm6.esignal.biz
216.23.233.202	PTR	cm3.esignal.biz
216.23.233.202	A+PTR	cm7.esignal.biz
216.23.233.202	PTR	rcm3.esignal.biz
216.23.233.213	PTR	ip233-213.esignal.com
216.23.233.214	PTR	ip233-214.esignal.com
216.23.233.244	A+PTR	ns4.esignal.com
216.23.233.245	A+PTR	ns5.esignal.com
216.23.233.247	A+PTR	ns6.esignal.biz