Robtex

Up: 204.194.160.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 204.194.168.0/22
Down right: 204.194.172.0/22

IP	Type	Hostname
204.194.168.0	PTR	user-36c5a00.cable.mindspring.com
204.194.168.114	A+PTR	user-36c5a3i.cable.mindspring.com
204.194.168.169	A+PTR	user-36c5a59.cable.mindspring.com
204.194.168.203	A	user-36c5a6b.cable.mindspring.com
204.194.168.225	A+PTR	user-36c5a71.cable.mindspring.com
204.194.168.251	PTR	user-36c5a7r.cable.mindspring.com
204.194.168.251	A	chesterfield.dhs.org
204.194.168.251	A	johnwinters.org
204.194.169.20	A	user-36c5a8k.cable.mindspring.com
204.194.169.103	A	user-36c5ab7.cable.mindspring.com
204.194.169.121	PTR	user-36c5abp.cable.mindspring.com
204.194.169.183	A	user-36c5adn.cable.mindspring.com
204.194.169.225	A+PTR	user-36c5af1.cable.mindspring.com
204.194.170.35	PTR	user-36c5ah3.cable.mindspring.com
204.194.170.101	A	user-36c5aj5.cable.mindspring.com
204.194.170.168	PTR	user-36c5al8.cable.mindspring.com
204.194.170.182	A	user-36c5alm.cable.mindspring.com
204.194.170.196	A	user-36c5am4.cable.mindspring.com
204.194.170.201	PTR	user-36c5am9.cable.mindspring.com
204.194.170.203	PTR	user-36c5amb.cable.mindspring.com
204.194.170.207	A	user-36c5amf.cable.mindspring.com
204.194.170.210	A+PTR	user-36c5ami.cable.mindspring.com
204.194.170.212	A	user-36c5amk.cable.mindspring.com
204.194.171.27	A+PTR	user-36c5aor.cable.mindspring.com
204.194.171.59	A+PTR	user-36c5apr.cable.mindspring.com