Robtex

Up: 68.16.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 68.16.136.0/23
Down right: 68.16.138.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.16.136.6	A+PTR	adsl-068-016-136-006.sip.bix.bellsouth.net
68.16.136.129	A+PTR	adsl-068-016-136-129.sip.bix.bellsouth.net
68.16.136.162	A+PTR	adsl-068-016-136-162.sip.bix.bellsouth.net
68.16.137.49	A+PTR	adsl-068-016-137-049.sip.bix.bellsouth.net
68.16.137.114	A+PTR	adsl-068-016-137-114.sip.bix.bellsouth.net
68.16.137.137	A+PTR	adsl-068-016-137-137.sip.bix.bellsouth.net
68.16.137.139	A+PTR	adsl-068-016-137-139.sip.bix.bellsouth.net
68.16.137.225	A+PTR	adsl-068-016-137-225.sip.bix.bellsouth.net
68.16.138.7	A+PTR	adsl-068-016-138-007.sip.bix.bellsouth.net
68.16.138.9	A+PTR	adsl-068-016-138-009.sip.bix.bellsouth.net
68.16.138.28	A+PTR	adsl-068-016-138-028.sip.bix.bellsouth.net
68.16.138.37	A+PTR	adsl-068-016-138-037.sip.bix.bellsouth.net
68.16.138.49	A+PTR	adsl-068-016-138-049.sip.bix.bellsouth.net
68.16.138.80	A+PTR	adsl-068-016-138-080.sip.bix.bellsouth.net
68.16.138.90	A+PTR	adsl-068-016-138-090.sip.bix.bellsouth.net
68.16.138.118	A+PTR	adsl-068-016-138-118.sip.bix.bellsouth.net
68.16.138.146	A+PTR	adsl-068-016-138-146.sip.bix.bellsouth.net
68.16.138.153	A+PTR	adsl-068-016-138-153.sip.bix.bellsouth.net
68.16.138.156	A+PTR	adsl-068-016-138-156.sip.bix.bellsouth.net
68.16.138.166	A+PTR	adsl-068-016-138-166.sip.bix.bellsouth.net
68.16.138.178	A+PTR	adsl-068-016-138-178.sip.bix.bellsouth.net
68.16.138.183	A+PTR	adsl-068-016-138-183.sip.bix.bellsouth.net
68.16.138.187	A+PTR	adsl-068-016-138-187.sip.bix.bellsouth.net
68.16.138.190	A+PTR	adsl-068-016-138-190.sip.bix.bellsouth.net
68.16.138.210	A+PTR	adsl-068-016-138-210.sip.bix.bellsouth.net
68.16.138.222	A	mail.americanpublicrealty.com
68.16.138.222	A	mstaxdeeds.com
68.16.138.222	A	www.americanpublicrealty.com
68.16.138.225	A+PTR	adsl-068-016-138-225.sip.bix.bellsouth.net
68.16.138.232	A+PTR	adsl-068-016-138-232.sip.bix.bellsouth.net
68.16.138.233	A+PTR	adsl-068-016-138-233.sip.bix.bellsouth.net
68.16.138.238	A+PTR	adsl-068-016-138-238.sip.bix.bellsouth.net
68.16.138.246	A+PTR	adsl-068-016-138-246.sip.bix.bellsouth.net
68.16.139.162	A+PTR	adsl-068-016-139-162.sip.bix.bellsouth.net
68.16.139.202	A+PTR	adsl-068-016-139-202.sip.bix.bellsouth.net
68.16.139.226	A+PTR	adsl-068-016-139-226.sip.bix.bellsouth.net