Robtex

Up: 196.28.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 196.28.52.0/23
Down right: 196.28.54.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
196.28.52.1	PTR	vpn.fw.bay.claropr.com
196.28.52.1	A	196-28-52-1.ao.prtc.net
196.28.52.1	A	www.ocspr.net
196.28.52.53	A	196-28-52-53.ao.prtc.net
196.28.53.121	A+PTR	mail2.mendezcopr.com
196.28.53.121	A	mail.mendezcopr.com
196.28.53.121	A	mx.mendezcopr.com
196.28.53.123	PTR	196-28-53-123.prtc.net
196.28.53.123	A	dns.mendezcopr.com
196.28.54.21	PTR	wmail.bbvpr.com
196.28.54.28	A	mail.orientalpr.com
196.28.54.93	PTR	196-28-54-93.prtc.net
196.28.54.202	PTR	prmailcc.ccprb.com
196.28.54.202	A	mail.yscoffee.com
196.28.54.202	A	ccprb.com
196.28.54.229	PTR	196-28-54-229.prtc.net
196.28.54.230	PTR	196-28-54-230.prtc.net
196.28.54.231	PTR	cee.gobierno.pr
196.28.54.231	A	www.cee.pr.gov
196.28.54.231	A	cee.pr.gov
196.28.55.72	PTR	196-28-55-72.prtc.net
196.28.55.72	A	deltamigo.com