Robtex

Up: 67.172.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 67.172.64.0/23
Down right: 67.172.66.0/23

IP	Type	Hostname
67.172.64.31	PTR	c-67-172-64-31.hsd1.fl.comcast.net
67.172.64.73	A+PTR	c-67-172-64-73.hsd1.fl.comcast.net
67.172.64.214	PTR	c-67-172-64-214.hsd1.fl.comcast.net
67.172.65.2	PTR	c-67-172-65-2.hsd1.fl.comcast.net
67.172.65.43	A	c-67-172-65-43.hsd1.fl.comcast.net
67.172.65.46	PTR	smtp.bizmail.yahoo.com
67.172.65.46	A+PTR	c-67-172-65-46.hsd1.fl.comcast.net
67.172.65.65	A	c-67-172-65-65.hsd1.fl.comcast.net
67.172.65.80	PTR	c-67-172-65-80.hsd1.fl.comcast.net
67.172.66.20	A+PTR	c-67-172-66-20.hsd1.fl.comcast.net
67.172.66.208	A	ntxserver.com
67.172.66.208	A	vpn.ntxserver.com
67.172.67.41	A+PTR	c-67-172-67-41.hsd1.fl.comcast.net
67.172.67.85	A+PTR	c-67-172-67-85.hsd1.fl.comcast.net
67.172.67.192	PTR	c-67-172-67-192.hsd1.fl.comcast.net
67.172.67.192	A	kershoc.com