Robtex

Up: 139.228.224.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 139.228.232.0/22
Down right: 139.228.236.0/22

IP	Type	Hostname
139.228.233.167	PTR	fm-dyn-139-228-233-167.fast.net.id
139.228.235.111	PTR	fm-dyn-139-228-235-111.fast.net.id
139.228.235.129	PTR	fm-dyn-139-228-235-129.fast.net.id
139.228.235.151	PTR	fm-dyn-139-228-235-151.fast.net.id
139.228.235.222	PTR	fm-dyn-139-228-235-222.fast.net.id
139.228.237.4	PTR	fm-dyn-139-228-237-4.fast.net.id
139.228.237.122	PTR	fm-dyn-139-228-237-122.fast.net.id
139.228.239.47	PTR	fm-dyn-139-228-239-47.fast.net.id
139.228.239.218	PTR	fm-dyn-139-228-239-218.fast.net.id