Robtex

Up: 139.194.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 139.194.40.0/22
Down right: 139.194.44.0/22

IP	Type	Hostname
139.194.40.125	PTR	fm-dyn-139-194-40-125.fast.net.id
139.194.44.65	PTR	fm-dyn-139-194-44-65.fast.net.id
139.194.45.73	PTR	fm-dyn-139-194-45-73.fast.net.id
139.194.45.240	PTR	fm-dyn-139-194-45-240.fast.net.id
139.194.46.241	PTR	fm-dyn-139-194-46-241.fast.net.id
139.194.47.135	PTR	fm-dyn-139-194-47-135.fast.net.id
139.194.47.233	PTR	fm-dyn-139-194-47-233.fast.net.id