Robtex

Up: 68.87.72.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 68.87.72.0/25
Down right: 68.87.72.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.87.72.2	A	vl-301-ur04.area4.il.chicago.comcast.net
68.87.72.3	A+PTR	vl-301-ur05.area4.il.chicago.comcast.net
68.87.72.4	A+PTR	sas-chic-01p.area4.il.chicago.comcast.net
68.87.72.5	A+PTR	ids01.area4.il.chicago.comcast.net
68.87.72.17	A	detr1-dpe03.chicago.il.chicago.comcast.net
68.87.72.22	A+PTR	copatest-chic-a01d.sys.comcast.net
68.87.72.23	A+PTR	copasp-chic-a01p.sys.comcast.net
68.87.72.37	A+PTR	pma1.area4.il.chicago.comcast.net
68.87.72.50	A+PTR	ica01.area4.il.chicago.comcast.net
68.87.72.123	A+PTR	opsw02.area4.il.chicago.comcast.net
68.87.72.129	A+PTR	vl250.area4.il.chicago.comcast.net
68.87.72.130	A+PTR	chic-cns.area4.il.chicago.comcast.net
68.87.72.130	A+PTR	nrcns.area4.il.chicago.comcast.net
68.87.72.131	A+PTR	chic-cns01b.area4.il.chicago.comcast.net
68.87.72.131	A	chic-nrcns01.area4.il.chicago.comcast.net
68.87.72.132	A+PTR	chic-cns02b.area4.il.chicago.comcast.net
68.87.72.132	A	chic-nrcns02.area4.il.chicago.comcast.net
68.87.72.133	PTR	chic-dnssec01.area4.il.chicago.comcast.net
68.87.72.134	A+PTR	cns.area4.il.chicago.comcast.net
68.87.72.137	A+PTR	chic-dnssec02.area4.il.chicago.comcast.net
68.87.72.141	A+PTR	chic-dnssec01b.area4.il.chicago.comcast.net
68.87.72.142	A+PTR	chic-dnssec02b.area4.il.chicago.comcast.net
68.87.72.157	PTR	ge-2-6-ur05-d.area4.il.chicago.comcast.net
68.87.72.181	A+PTR	chic-ddns01.area4.il.chicago.comcast.net
68.87.72.183	A+PTR	ddns.area4.il.chicago.comcast.net
68.87.72.190	A	fe-1-14-mr01.philadelphia.pa.mgmt.comcast.net
68.87.72.195	A+PTR	vl-666-ur05.area4.il.chicago.comcast.net
68.87.72.196	PTR	ilo-chic-cdn01.area4.il.chicago.comcast.net
68.87.72.201	PTR	ilo-chic-ddns21-lo.area4.il.chicago.comcast.net
68.87.72.202	A+PTR	lo-rproxy01.area4.il.chicago.comcast.net
68.87.72.203	PTR	lo-rproxy02.area4.il.chicago.comcast.net
68.87.72.208	A	cx01-2-vms2.coatesville.pa.panjde.comcast.net
68.87.72.209	A+PTR	lo-chic-cns03.area4.il.chicago.comcast.net
68.87.72.226	A+PTR	vl-40-notify-lb01.area4.il.chicago.comcast.net
68.87.72.244	PTR	dns105.comcast.net
68.87.72.244	A	ns.fandangofavors.net
68.87.72.244	A	ns.p2prightsandresponsibilities.org
68.87.72.246	A+PTR	dns105e.area4.il.chicago.comcast.net
68.87.72.247	A+PTR	dns105-sec.area4.il.chicago.comcast.net
68.87.72.250	A+PTR	dns105f.area4.il.chicago.comcast.net
68.87.72.251	PTR	dns105f-sec.area4.il.chicago.comcast.net
68.87.72.252	A+PTR	dns105g.area4.il.chicago.comcast.net