Robtex

Up: 196.32.128.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 196.32.128.0/25
Down right: 196.32.128.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
196.32.128.19	A+PTR	mx1.caribbean.edu
196.32.128.19	PTR	mx5.caribbean.edu
196.32.128.19	PTR	19-128-32-196-static.centennialpr.net
196.32.128.20	A+PTR	mx6.caribbean.edu
196.32.128.20	PTR	20-128-32-196-static.centennialpr.net
196.32.128.20	A	mx4.vegabaja.caribbean.edu
196.32.128.79	PTR	79-128-32-196-static.centennialpr.net
196.32.128.79	A	web.centennialpr.net
196.32.128.250	PTR	250-128-32-196-static.centennialpr.net