Robtex

Up: 139.0.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 139.0.56.0/22
Down right: 139.0.60.0/22

IP	Type	Hostname
139.0.56.49	PTR	fm-dyn-139-0-56-49.fast.net.id
139.0.56.202	PTR	fm-dyn-139-0-56-202.fast.net.id
139.0.56.211	PTR	fm-dyn-139-0-56-211.fast.net.id
139.0.57.57	PTR	fm-dyn-139-0-57-57.fast.net.id
139.0.58.146	PTR	fm-dyn-139-0-58-146.fast.net.id
139.0.58.155	PTR	fm-dyn-139-0-58-155.fast.net.id
139.0.59.59	PTR	fm-dyn-139-0-59-59.fast.net.id
139.0.59.210	PTR	fm-dyn-139-0-59-210.fast.net.id
139.0.60.175	PTR	fm-dyn-139-0-60-175.fast.net.id
139.0.60.226	PTR	fm-dyn-139-0-60-226.fast.net.id
139.0.63.227	PTR	fm-dyn-139-0-63-227.fast.net.id