Robtex

Up: 68.73.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 68.73.160.0/20
Down right: 68.73.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.73.162.246	A+PTR	remote.bogartarchitecture.com
68.73.162.246	A	mail.bogartarchitecture.com
68.73.164.197	A	adsl-68-73-164-197.dsl.bcvloh.ameritech.net
68.73.165.177	PTR	adsl-68-73-165-177.dsl.bcvloh.ameritech.net
68.73.166.64	PTR	adsl-68-73-166-64.dsl.bcvloh.ameritech.net
68.73.166.201	PTR	adsl-68-73-166-201.dsl.bcvloh.ameritech.net
68.73.167.39	A+PTR	adsl-68-73-167-39.dsl.bcvloh.ameritech.net
68.73.167.255	PTR	adsl-68-73-167-255.dsl.bcvloh.ameritech.net
68.73.172.99	A	adsl-68-73-172-99.dsl.bcvloh.ameritech.net
68.73.175.6	PTR	mail.riverpres.org
68.73.175.118	A	mail2.aabacoplastics.com
68.73.179.77	A	bestpermitagency.com
68.73.179.225	A+PTR	adsl-68-73-179-225.dsl.bcvloh.ameritech.net
68.73.180.66	A	68-73-180-66.ded.ameritech.net
68.73.180.77	A	68-73-180-77.ded.ameritech.net
68.73.180.80	A	68-73-180-80.ded.ameritech.net
68.73.180.81	A	68-73-180-81.ded.ameritech.net
68.73.181.6	A	metalworks-ww.com
68.73.181.135	PTR	68-73-181-135.ceresseniorbenefits.com
68.73.181.135	A	ceresgp.com
68.73.181.164	PTR	68-73-181-164.ceresseniorbenefits.com
68.73.181.164	A	saversadvantage.com
68.73.181.195	A+PTR	mail.ceresseniorbenefits.com
68.73.181.195	A	mail.greatamericanseniorbenefits.com
68.73.181.195	A	mail.ceresgp.com
68.73.182.145	A	mail.kucerainternational.net
68.73.183.30	PTR	mail.cmm-inc.com
68.73.183.30	A	cmm-inc.com
68.73.183.145	A+PTR	adsl-68-73-183-145.dsl.bcvloh.ameritech.net
68.73.183.190	A+PTR	adsl-68-73-183-190.dsl.bcvloh.ameritech.net
68.73.183.190	A	mail.videogard.com
68.73.183.190	A	videogard.com