Robtex

Up: 72.73.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.73.56.0/22
Down right: 72.73.60.0/22

IP	Type	Hostname
72.73.56.2	PTR	mail.defensegp.com
72.73.56.3	PTR	finance1.defensegp.com
72.73.56.5	PTR	front-end.defensegp.com
72.73.56.6	PTR	vpn-server.defensegp.com
72.73.56.11	PTR	fbiserver.defensegp.com
72.73.56.12	PTR	cobra1.defensegp.com
72.73.56.13	PTR	timesheet.defensegp.com
72.73.56.148	PTR	mail.hitachifoundation.org
72.73.56.229	PTR	mail.visionaryproject.org
72.73.58.1	PTR	client-72-73-58-1.east.verizon.net
72.73.58.2	PTR	client-72-73-58-2.east.verizon.net
72.73.58.3	PTR	client-72-73-58-3.east.verizon.net
72.73.58.4	PTR	client-72-73-58-4.east.verizon.net
72.73.58.8	PTR	client-72-73-58-8.east.verizon.net
72.73.58.9	PTR	client-72-73-58-9.east.verizon.net
72.73.58.10	PTR	client-72-73-58-10.east.verizon.net
72.73.58.11	PTR	xchange.capitalhospice.org
72.73.58.16	PTR	client-72-73-58-16.east.verizon.net
72.73.58.17	PTR	client-72-73-58-17.east.verizon.net
72.73.58.18	PTR	client-72-73-58-18.east.verizon.net
72.73.58.19	PTR	client-72-73-58-19.east.verizon.net
72.73.58.24	PTR	client-72-73-58-24.east.verizon.net
72.73.58.25	PTR	client-72-73-58-25.east.verizon.net
72.73.58.26	PTR	client-72-73-58-26.east.verizon.net
72.73.58.27	PTR	client-72-73-58-27.east.verizon.net
72.73.58.32	PTR	client-72-73-58-32.east.verizon.net
72.73.58.33	PTR	client-72-73-58-33.east.verizon.net
72.73.58.34	PTR	client-72-73-58-34.east.verizon.net
72.73.58.35	PTR	client-72-73-58-35.east.verizon.net
72.73.58.40	PTR	client-72-73-58-40.east.verizon.net
72.73.58.41	PTR	client-72-73-58-41.east.verizon.net
72.73.58.42	PTR	client-72-73-58-42.east.verizon.net
72.73.58.43	PTR	client-72-73-58-43.east.verizon.net
72.73.58.48	PTR	client-72-73-58-48.east.verizon.net
72.73.58.49	PTR	client-72-73-58-49.east.verizon.net
72.73.58.50	PTR	client-72-73-58-50.east.verizon.net
72.73.58.51	PTR	client-72-73-58-51.east.verizon.net
72.73.58.56	PTR	client-72-73-58-56.east.verizon.net
72.73.58.57	PTR	client-72-73-58-57.east.verizon.net
72.73.58.59	PTR	client-72-73-58-59.east.verizon.net
72.73.58.64	PTR	client-72-73-58-64.east.verizon.net
72.73.58.65	PTR	client-72-73-58-65.east.verizon.net
72.73.58.66	PTR	client-72-73-58-66.east.verizon.net
72.73.58.67	PTR	client-72-73-58-67.east.verizon.net
72.73.58.72	PTR	client-72-73-58-72.east.verizon.net
72.73.58.73	PTR	client-72-73-58-73.east.verizon.net
72.73.58.74	PTR	client-72-73-58-74.east.verizon.net
72.73.58.75	PTR	client-72-73-58-75.east.verizon.net
72.73.58.80	PTR	client-72-73-58-80.east.verizon.net
72.73.58.81	PTR	client-72-73-58-81.east.verizon.net
72.73.58.83	PTR	client-72-73-58-83.east.verizon.net
72.73.58.88	PTR	client-72-73-58-88.east.verizon.net
72.73.58.89	PTR	client-72-73-58-89.east.verizon.net
72.73.58.91	PTR	client-72-73-58-91.east.verizon.net
72.73.58.96	PTR	client-72-73-58-96.east.verizon.net
72.73.58.97	PTR	client-72-73-58-97.east.verizon.net
72.73.58.98	PTR	client-72-73-58-98.east.verizon.net
72.73.58.99	PTR	client-72-73-58-99.east.verizon.net
72.73.58.104	PTR	client-72-73-58-104.east.verizon.net
72.73.58.105	PTR	client-72-73-58-105.east.verizon.net
72.73.58.106	PTR	client-72-73-58-106.east.verizon.net
72.73.58.107	PTR	client-72-73-58-107.east.verizon.net
72.73.58.112	PTR	client-72-73-58-112.east.verizon.net
72.73.58.113	PTR	client-72-73-58-113.east.verizon.net
72.73.58.114	PTR	client-72-73-58-114.east.verizon.net
72.73.58.115	PTR	client-72-73-58-115.east.verizon.net
72.73.58.120	PTR	client-72-73-58-120.east.verizon.net
72.73.58.121	PTR	client-72-73-58-121.east.verizon.net
72.73.58.122	PTR	client-72-73-58-122.east.verizon.net
72.73.58.123	PTR	client-72-73-58-123.east.verizon.net
72.73.58.128	PTR	client-72-73-58-128.east.verizon.net
72.73.58.129	PTR	client-72-73-58-129.east.verizon.net
72.73.58.130	PTR	client-72-73-58-130.east.verizon.net
72.73.58.131	PTR	client-72-73-58-131.east.verizon.net
72.73.58.136	PTR	client-72-73-58-136.east.verizon.net
72.73.58.137	PTR	client-72-73-58-137.east.verizon.net
72.73.58.138	PTR	client-72-73-58-138.east.verizon.net
72.73.58.139	PTR	client-72-73-58-139.east.verizon.net
72.73.58.144	PTR	client-72-73-58-144.east.verizon.net
72.73.58.145	PTR	client-72-73-58-145.east.verizon.net
72.73.58.146	PTR	client-72-73-58-146.east.verizon.net
72.73.58.147	PTR	client-72-73-58-147.east.verizon.net
72.73.58.152	PTR	client-72-73-58-152.east.verizon.net
72.73.58.153	PTR	client-72-73-58-153.east.verizon.net
72.73.58.154	PTR	client-72-73-58-154.east.verizon.net
72.73.58.155	PTR	client-72-73-58-155.east.verizon.net
72.73.58.160	PTR	client-72-73-58-160.east.verizon.net
72.73.58.161	PTR	client-72-73-58-161.east.verizon.net
72.73.58.162	PTR	client-72-73-58-162.east.verizon.net
72.73.58.163	PTR	client-72-73-58-163.east.verizon.net
72.73.58.168	PTR	client-72-73-58-168.east.verizon.net
72.73.58.169	PTR	client-72-73-58-169.east.verizon.net
72.73.58.170	PTR	client-72-73-58-170.east.verizon.net
72.73.58.171	PTR	client-72-73-58-171.east.verizon.net
72.73.58.176	PTR	client-72-73-58-176.east.verizon.net
72.73.58.177	PTR	client-72-73-58-177.east.verizon.net
72.73.58.178	PTR	client-72-73-58-178.east.verizon.net
72.73.58.179	PTR	client-72-73-58-179.east.verizon.net
72.73.58.184	PTR	client-72-73-58-184.east.verizon.net
72.73.58.185	PTR	client-72-73-58-185.east.verizon.net
72.73.58.186	PTR	client-72-73-58-186.east.verizon.net
72.73.58.187	PTR	client-72-73-58-187.east.verizon.net
72.73.58.192	PTR	client-72-73-58-192.east.verizon.net
72.73.58.193	PTR	client-72-73-58-193.east.verizon.net
72.73.58.194	PTR	client-72-73-58-194.east.verizon.net
72.73.58.195	PTR	client-72-73-58-195.east.verizon.net
72.73.58.200	PTR	client-72-73-58-200.east.verizon.net
72.73.58.201	PTR	client-72-73-58-201.east.verizon.net
72.73.58.202	PTR	client-72-73-58-202.east.verizon.net
72.73.58.203	PTR	client-72-73-58-203.east.verizon.net
72.73.58.208	PTR	client-72-73-58-208.east.verizon.net
72.73.58.209	PTR	client-72-73-58-209.east.verizon.net
72.73.58.210	PTR	client-72-73-58-210.east.verizon.net
72.73.58.211	PTR	client-72-73-58-211.east.verizon.net
72.73.58.216	PTR	client-72-73-58-216.east.verizon.net
72.73.58.217	PTR	client-72-73-58-217.east.verizon.net
72.73.58.218	PTR	client-72-73-58-218.east.verizon.net
72.73.58.219	PTR	client-72-73-58-219.east.verizon.net
72.73.58.224	PTR	client-72-73-58-224.east.verizon.net
72.73.58.225	PTR	client-72-73-58-225.east.verizon.net
72.73.58.226	PTR	client-72-73-58-226.east.verizon.net
72.73.58.227	PTR	client-72-73-58-227.east.verizon.net
72.73.58.232	PTR	client-72-73-58-232.east.verizon.net
72.73.58.233	PTR	client-72-73-58-233.east.verizon.net
72.73.58.234	PTR	client-72-73-58-234.east.verizon.net
72.73.58.235	PTR	client-72-73-58-235.east.verizon.net
72.73.58.240	PTR	client-72-73-58-240.east.verizon.net
72.73.58.241	PTR	client-72-73-58-241.east.verizon.net
72.73.58.242	PTR	client-72-73-58-242.east.verizon.net
72.73.58.243	PTR	client-72-73-58-243.east.verizon.net
72.73.58.248	PTR	client-72-73-58-248.east.verizon.net
72.73.58.249	PTR	client-72-73-58-249.east.verizon.net
72.73.58.250	PTR	client-72-73-58-250.east.verizon.net
72.73.58.251	PTR	client-72-73-58-251.east.verizon.net
72.73.61.188	A	orbitzweddings.net
72.73.61.188	A	orbitzweddings.com
72.73.61.188	A	theidealbeach.com
72.73.62.154	PTR	mail.winklerpreserve.org
72.73.63.18	PTR	mail.bciva.com