Robtex

Up: 139.193.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 139.193.4.0/23
Down right: 139.193.6.0/23

IP	Type	Hostname
139.193.4.2	PTR	fm-dyn-139-193-4-2.fast.net.id
139.193.4.36	PTR	fm-dyn-139-193-4-36.fast.net.id
139.193.4.145	PTR	fm-dyn-139-193-4-145.fast.net.id
139.193.5.2	PTR	fm-dyn-139-193-5-2.fast.net.id
139.193.5.163	PTR	fm-dyn-139-193-5-163.fast.net.id
139.193.5.247	PTR	fm-dyn-139-193-5-247.fast.net.id
139.193.6.99	PTR	fm-dyn-139-193-6-99.fast.net.id
139.193.6.115	A	mail.deweyserver.com
139.193.6.121	PTR	fm-dyn-139-193-6-121.fast.net.id
139.193.7.2	PTR	fm-dyn-139-193-7-2.fast.net.id