Robtex

Up: 74.84.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 74.84.152.0/22
Down right: 74.84.156.0/22

IP	Type	Hostname
74.84.153.3	PTR	client.hopone.net
74.84.153.18	PTR	client.hopone.net
74.84.153.35	PTR	client.hopone.net
74.84.153.49	PTR	client.hopone.net
74.84.153.51	PTR	client.hopone.net
74.84.153.57	PTR	client.hopone.net
74.84.153.75	PTR	client.hopone.net
74.84.153.115	PTR	client.hopone.net
74.84.153.120	PTR	client.hopone.net
74.84.153.123	PTR	client.hopone.net
74.84.153.168	PTR	client.hopone.net
74.84.153.170	PTR	client.hopone.net
74.84.153.176	PTR	client.hopone.net
74.84.153.217	PTR	client.hopone.net
74.84.153.232	PTR	client.hopone.net
74.84.153.233	PTR	client.hopone.net
74.84.153.240	PTR	client.hopone.net
74.84.153.241	PTR	client.hopone.net
74.84.153.243	PTR	client.hopone.net
74.84.154.177	PTR	client.hopone.net