Robtex

Up: 87.216.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 87.216.24.0/23
Down right: 87.216.26.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.216.24.7	A+PTR	7.24.216.87.static.jazztel.es
87.216.24.26	PTR	26.24.216.87.static.jazztel.es
87.216.24.26	A	smtp1.aecomplutense.com
87.216.24.26	A	ns2.morasa.com
87.216.24.37	A	www5.personasytecnicas.com
87.216.24.40	PTR	soxtec.net
87.216.24.40	A	40.24.216.87.static.jazztel.es
87.216.24.41	A	backup.gallartgrupo.com
87.216.24.44	PTR	44.24.216.87.static.jazztel.es
87.216.25.134	A+PTR	134.25.216.87.static.jazztel.es
87.216.27.12	PTR	12.27.216.87.static.jazztel.es
87.216.27.37	PTR	37.27.216.87.static.jazztel.es
87.216.27.37	A	correo.catrian.net
87.216.27.156	PTR	156.27.216.87.static.jazztel.es