Robtex

Up: 212.21.192.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 212.21.192.0/20
Down right: 212.21.208.0/20

IP	Type	Hostname
212.21.192.0	PTR	a0.fluent.be
212.21.192.33	PTR	a33.fluent.be
212.21.192.131	PTR	a131.fluent.be
212.21.192.160	PTR	a160.fluent.be
212.21.192.224	PTR	a224.fluent.be
212.21.192.225	PTR	a225.fluent.be
212.21.192.227	PTR	a227.fluent.be
212.21.195.67	PTR	212-21-195-67.eu.bt.net
212.21.195.97	PTR	212-21-195-97.eu.bt.net
212.21.195.128	PTR	212-21-195-128.eu.bt.net
212.21.195.160	PTR	212-21-195-160.eu.bt.net
212.21.195.163	PTR	212-21-195-163.eu.bt.net
212.21.195.192	PTR	212-21-195-192.eu.bt.net
212.21.195.194	PTR	212-21-195-194.eu.bt.net
212.21.195.225	PTR	212-21-195-225.eu.bt.net
212.21.196.10	PTR	smtpsend.it.corio-eu.com