Robtex

Up: 140.0.152.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 140.0.156.0/23
Down right: 140.0.158.0/23

IP	Type	Hostname
140.0.156.36	PTR	fm-dyn-140-0-156-36.fast.net.id
140.0.156.190	PTR	fm-dyn-140-0-156-190.fast.net.id
140.0.156.202	PTR	fm-dyn-140-0-156-202.fast.net.id
140.0.157.36	PTR	fm-dyn-140-0-157-36.fast.net.id
140.0.159.135	PTR	fm-dyn-140-0-159-135.fast.net.id