Robtex

Up: 83.137.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 83.137.84.0/23
Down right: 83.137.86.0/23

IP	Type	Hostname
83.137.84.18	A	mail.eglin.ch
83.137.85.81	PTR	81.85.rev.fibrelac.com
83.137.85.182	PTR	182.85.rev.fibrelac.com
83.137.85.207	PTR	207.85.rev.fibrelac.com
83.137.86.34	PTR	34.86.rev.fibrelac.com
83.137.86.99	PTR	99.86.rev.fibrelac.com
83.137.86.210	PTR	210.86.rev.fibrelac.com
83.137.86.238	PTR	238.86.rev.fibrelac.com
83.137.87.43	PTR	43.87.rev.fibrelac.com
83.137.87.231	PTR	231.87.rev.fibrelac.com
83.137.87.236	PTR	236.87.rev.fibrelac.com
83.137.87.255	PTR	255.87.rev.fibrelac.com