Robtex

Up: 68.84.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 68.84.128.0/21
Down right: 68.84.136.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.84.128.4	PTR	c-68-84-128-4.hsd1.md.comcast.net
68.84.128.28	A	government30club.com
68.84.128.149	A	skysdb.com
68.84.128.149	A	esrwan.com
68.84.128.149	A	c-68-84-128-149.hsd1.md.comcast.net
68.84.128.226	PTR	c-68-84-128-226.hsd1.md.comcast.net
68.84.129.32	A+PTR	c-68-84-129-32.hsd1.md.comcast.net
68.84.129.32	A	ineedneighbors.com
68.84.129.112	PTR	c-68-84-129-112.hsd1.md.comcast.net
68.84.133.78	PTR	c-68-84-133-78.hsd1.md.comcast.net
68.84.133.89	A	virusupload.com
68.84.133.139	A+PTR	c-68-84-133-139.hsd1.md.comcast.net
68.84.136.27	A+PTR	c-68-84-136-27.hsd1.md.comcast.net
68.84.136.38	A+PTR	c-68-84-136-38.hsd1.md.comcast.net
68.84.136.193	A+PTR	c-68-84-136-193.hsd1.md.comcast.net
68.84.136.253	A+PTR	c-68-84-136-253.hsd1.md.comcast.net
68.84.137.41	A+PTR	c-68-84-137-41.hsd1.va.comcast.net
68.84.137.183	A+PTR	c-68-84-137-183.hsd1.va.comcast.net
68.84.137.237	A+PTR	c-68-84-137-237.hsd1.va.comcast.net
68.84.138.84	A	c-68-84-138-84.hsd1.va.comcast.net
68.84.139.25	A+PTR	c-68-84-139-25.hsd1.md.comcast.net
68.84.139.62	A+PTR	c-68-84-139-62.hsd1.md.comcast.net
68.84.139.62	A	comcast.ccosda.org
68.84.139.190	PTR	c-68-84-139-190.hsd1.md.comcast.net
68.84.139.190	PTR	c-68-84-139-190.hsd1.va.comcast.net
68.84.139.195	A+PTR	c-68-84-139-195.hsd1.md.comcast.net
68.84.139.195	A	jburso.com
68.84.139.208	A	jacobrettig.com
68.84.140.5	A+PTR	c-68-84-140-5.hsd1.wv.comcast.net
68.84.140.143	A+PTR	c-68-84-140-143.hsd1.wv.comcast.net
68.84.140.192	A+PTR	c-68-84-140-192.hsd1.wv.comcast.net
68.84.140.213	A	haniafarah.com
68.84.140.213	A	mail.sysmanage.com
68.84.140.213	A	leefarah.com
68.84.140.227	A+PTR	c-68-84-140-227.hsd1.wv.comcast.net
68.84.142.159	A	c-68-84-142-159.hsd1.md.comcast.net
68.84.143.25	A	c-68-84-143-25.hsd1.dc.comcast.net
68.84.143.32	PTR	c-68-84-143-32.hsd1.dc.comcast.net
68.84.143.83	A+PTR	c-68-84-143-83.hsd1.dc.comcast.net
68.84.143.167	A	c-68-84-143-167.hsd1.dc.comcast.net
68.84.143.191	A	c-68-84-143-191.hsd1.dc.comcast.net