Robtex

Up: 12.191.144.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 12.191.148.0/23
Down right: 12.191.150.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
12.191.148.4	PTR	mail01.bluebirdwireless.com
12.191.148.4	A	schoonoverinvestments.com
12.191.148.4	A	mail.bossierassessor.com
12.191.148.5	PTR	mail02.bluebirdwireless.com
12.191.148.5	A	jagop.com
12.191.148.17	PTR	www.caddo911.com
12.191.150.1	PTR	gateway-12-191-150.bluebirdwireless.com
12.191.150.2	PTR	cust-12-191-150-2.bluebirdwireless.com
12.191.150.4	PTR	mail.shrevecomm.net
12.191.150.9	PTR	cust-12-191-150-9.bluebirdwireless.com
12.191.150.10	PTR	cust-12-191-150-10.bluebirdwireless.com
12.191.150.13	PTR	cust-12-191-150-13.bluebirdwireless.com
12.191.150.21	PTR	cust-12-191-150-21.bluebirdwireless.com
12.191.150.22	PTR	cust-12-191-150-22.bluebirdwireless.com
12.191.150.26	PTR	cust-12-191-150-26.bluebirdwireless.com
12.191.150.28	PTR	cust-12-191-150-28.bluebirdwireless.com
12.191.150.33	PTR	mail.moremanmoore.com
12.191.150.37	PTR	cust-12-191-150-37.bluebirdwireless.com
12.191.150.41	PTR	cust-12-191-150-41.bluebirdwireless.com
12.191.150.49	PTR	cust-12-191-150-49.bluebirdwireless.com
12.191.150.68	PTR	cust-12-191-150-68.bluebirdwireless.com
12.191.150.203	PTR	cust-12-191-150-203.bluebirdwireless.com
12.191.150.205	PTR	cust-12-191-150-205.bluebirdwireless.com
12.191.150.218	PTR	cust-12-191-150-218.bluebirdwireless.com
12.191.150.229	PTR	cust-12-191-150-229.bluebirdwireless.com
12.191.150.232	PTR	cust-12-191-150-232.bluebirdwireless.com
12.191.150.250	PTR	cust-12-191-150-250.bluebirdwireless.com
12.191.150.254	PTR	cust-12-191-150-254.bluebirdwireless.com
12.191.151.37	PTR	barracuda.biomed.org
12.191.151.37	A	barracuda.intertechsciencepark.com
12.191.151.37	A	barracuda.intertechsciencepark.org