Robtex

Up: 87.216.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 87.216.20.0/23
Down right: 87.216.22.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.216.20.59	PTR	59.20.216.87.static.jazztel.es
87.216.20.59	A	switches.com.es
87.216.20.59	A	ns2.tiendavozip.com
87.216.20.162	A+PTR	162.20.216.87.static.jazztel.es
87.216.21.16	A	16.21.216.87.static.jazztel.es
87.216.21.33	PTR	33.21.216.87.static.jazztel.es
87.216.21.63	PTR	mail.syscad.es
87.216.21.125	A	mail.schmidt-madrid.com
87.216.21.198	A	anteaformacion.com
87.216.22.2	A	2.22.216.87.static.jazztel.es
87.216.22.4	A+PTR	4.22.216.87.static.jazztel.es
87.216.22.165	PTR	165.22.216.87.static.jazztel.es
87.216.22.180	A	180.22.216.87.static.jazztel.es
87.216.22.216	A	mail.domenech-advocats.com
87.216.22.216	A	smtp.domenech-advocats.com
87.216.23.3	A+PTR	3.23.216.87.static.jazztel.es
87.216.23.241	PTR	241.23.216.87.static.jazztel.es