Robtex

Up: 68.15.40.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 68.15.41.0/25
Down right: 68.15.41.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.15.41.56	A	mail.instituteopex.com
68.15.41.56	A	mail.instituteopex.org
68.15.41.56	A	mail.dugganinc.com
68.15.41.109	A+PTR	wsip-68-15-41-109.ri.ri.cox.net
68.15.41.109	A	mail.ultrasci.com
68.15.41.109	A	*.ultrasci.com
68.15.41.123	PTR	wsip-68-15-41-123.ri.ri.cox.net
68.15.41.123	A	office.fap-inc.com
68.15.41.123	A	fap-border-gw.fap-inc.com
68.15.41.134	PTR	wsip-68-15-41-134.ri.ri.cox.net
68.15.41.152	A	mail.northeaststeel.com
68.15.41.152	A	northeaststeel.com
68.15.41.183	A	mail.kennedy-inc.com
68.15.41.187	A	insight-associates.com
68.15.41.215	A+PTR	appliedradar.com
68.15.41.215	A	digiwavesys.com
68.15.41.215	A	skylanesinc.com
68.15.41.216	PTR	wsip-68-15-41-216.ri.ri.cox.net
68.15.41.216	A	quonset2.appliedradar.com
68.15.41.224	A+PTR	wsip-68-15-41-224.ri.ri.cox.net
68.15.41.224	A	mx.scalabrinivilla.com