Robtex

Up: 172.81.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 172.81.140.0/23
Down right: 172.81.142.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
172.81.140.26	A	remote.rfsc-law.com
172.81.140.35	A	pdrma.org
172.81.140.37	A	ftp.pdrma.org
172.81.140.39	A	mail.pdrmafax.org
172.81.140.43	A	list.pdrma.org
172.81.140.83	A	ironwood.myprecisionhr.com
172.81.141.115	A	mail2.marathonmedia.com
172.81.141.115	A	mail.marathonmedia.com
172.81.141.199	A	rdocs.biz
172.81.142.115	A	ns1.studionorth.com
172.81.142.117	A	www.studionorth.net
172.81.142.117	A	staging.studionorth.net
172.81.142.117	A	www.staging.studionorth.net
172.81.142.120	A	thefrizzleys.com
172.81.142.122	A	seasonofgifing.com
172.81.142.212	A	mail.fnbmanhattan.com