Robtex

Up: 208.1.36.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 208.1.38.0/24
Down right: 208.1.39.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.1.38.20	PTR	208-1-38-20.volcanocom.com
208.1.38.42	PTR	208-1-38-42.volcanocom.com
208.1.38.157	PTR	208-1-38-157.dsl.volcano.net
208.1.39.4	PTR	208-1-39-4.dsl.volcano.net
208.1.39.53	PTR	208-1-39-53.volcanocom.com
208.1.39.248	PTR	208-1-39-248.dsl.volcano.net
208.1.39.248	A	ncoasouth.com
208.1.39.248	A	assignsports.com