Robtex

Up: 12.153.192.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 12.153.192.0/21
Down right: 12.153.200.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
12.153.192.21	A+PTR	dns1.tcsware.com
12.153.192.24	A+PTR	dns2.tcsware.com
12.153.192.25	A+PTR	mail1.tcsware.com
12.153.192.25	A	msalpr.com
12.153.192.43	A+PTR	sushi1.communigroup.net
12.153.192.43	A	www.finitevalidations.com
12.153.192.43	A	finitevalidations.com
12.153.192.45	A	infinitynetworks.biz
12.153.192.98	A	peabody.sourceonevideo.com
12.153.192.131	PTR	ns1.tecbb.net
12.153.192.131	A	ns1.communigroup.net
12.153.192.134	A+PTR	www.cgdsl.net
12.153.192.134	A	www.tecbb.net
12.153.192.134	A	cgdsl.net
12.153.192.163	A	copiahbank.us
12.153.192.163	A	hsehs.org
12.153.192.163	A	copiahbank.co
12.153.192.166	PTR	mrgreen.kidsvision.com
12.153.192.210	A+PTR	checkimage.thecitizensbankphila.com
12.153.192.250	A	mail.jbhm.com
12.153.198.82	PTR	12-153-198-82.lecnet.com
12.153.198.99	PTR	12-153-198-99.lecnet.com
12.153.199.240	A+PTR	240.199.153.12.cgdsl.net
12.153.200.247	A+PTR	firewall.lecnet.com
12.153.200.247	A	www.lecnet.com
12.153.200.247	A	lecnet.com
12.153.200.250	PTR	rad0.lecnet.com
12.153.201.213	A+PTR	bspstgr09.baysprings.teleclipse.net
12.153.202.47	PTR	12-153-202-47.lecnet.com
12.153.202.69	PTR	12-153-202-69.lecnet.com
12.153.204.224	A+PTR	pm1-33.wtenn.teleclipse.net
12.153.206.17	PTR	12-153-206-17.lecnet.com
12.153.206.44	PTR	12-153-206-44.lecnet.com
12.153.206.153	PTR	12-153-206-153.lecnet.com
12.153.207.64	PTR	12-153-207-64.lecnet.com
12.153.207.105	PTR	12-153-207-105.lecnet.com
12.153.207.158	PTR	12-153-207-158.lecnet.com