Robtex

Up: 204.139.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 204.139.8.0/22
Down right: 204.139.12.0/22

IP	Type	Hostname
204.139.8.0	A+PTR	204-139-8-0.client.dsl.net
204.139.8.2	A	204-139-8-2.client.dsl.net
204.139.9.43	A+PTR	204-139-9-43.client.dsl.net
204.139.9.47	A	204-139-9-47.client.dsl.net
204.139.9.89	A+PTR	204-139-9-89.client.dsl.net
204.139.9.136	A+PTR	204-139-9-136.client.dsl.net
204.139.9.147	A+PTR	204-139-9-147.client.dsl.net
204.139.9.148	A	204-139-9-148.client.dsl.net
204.139.9.172	A	204-139-9-172.client.dsl.net
204.139.9.174	A	204-139-9-174.client.dsl.net
204.139.9.179	A+PTR	204-139-9-179.client.dsl.net
204.139.9.214	A	204-139-9-214.client.dsl.net
204.139.9.247	A	204-139-9-247.client.dsl.net
204.139.10.2	PTR	204-139-10-2.client.dsl.net
204.139.10.146	A	mail.davidsonforwarding.com
204.139.10.146	A	mail16.davidsontransfer.com
204.139.10.146	A	mail.davidsontransfer.com