Robtex

Up: 173.19.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 173.19.136.0/22
Down right: 173.19.140.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
173.19.137.56	A+PTR	173-19-137-56.client.mchsi.com
173.19.137.136	A	173-19-137-136.client.mchsi.com
173.19.137.153	A+PTR	173-19-137-153.client.mchsi.com
173.19.137.170	A+PTR	173-19-137-170.client.mchsi.com
173.19.137.170	A	fiction-designs.com
173.19.137.170	A	scoutz.ddns.net
173.19.138.11	A+PTR	173-19-138-11.client.mchsi.com
173.19.138.11	A	enjubot.ddns.net
173.19.138.41	A+PTR	173-19-138-41.client.mchsi.com
173.19.138.97	A	173-19-138-97.client.mchsi.com
173.19.138.238	A+PTR	173-19-138-238.client.mchsi.com
173.19.139.137	A+PTR	173-19-139-137.client.mchsi.com
173.19.139.254	PTR	173-19-139-254.client.mchsi.com
173.19.140.1	A+PTR	173-19-140-1.client.mchsi.com
173.19.140.5	A	173-19-140-5.client.mchsi.com
173.19.140.7	A	173-19-140-7.client.mchsi.com
173.19.140.8	A+PTR	173-19-140-8.client.mchsi.com
173.19.140.14	A	173-19-140-14.client.mchsi.com
173.19.140.16	A+PTR	173-19-140-16.client.mchsi.com
173.19.140.18	A+PTR	173-19-140-18.client.mchsi.com
173.19.140.20	A	173-19-140-20.client.mchsi.com
173.19.140.25	A+PTR	173-19-140-25.client.mchsi.com
173.19.140.28	A	173-19-140-28.client.mchsi.com
173.19.140.32	A+PTR	173-19-140-32.client.mchsi.com
173.19.140.35	A+PTR	173-19-140-35.client.mchsi.com
173.19.140.39	A	173-19-140-39.client.mchsi.com
173.19.140.42	A+PTR	173-19-140-42.client.mchsi.com
173.19.140.45	A	173-19-140-45.client.mchsi.com
173.19.140.49	A+PTR	173-19-140-49.client.mchsi.com
173.19.140.51	A+PTR	173-19-140-51.client.mchsi.com
173.19.140.52	A	173-19-140-52.client.mchsi.com
173.19.140.53	A	173-19-140-53.client.mchsi.com
173.19.140.57	A+PTR	173-19-140-57.client.mchsi.com
173.19.140.65	A+PTR	173-19-140-65.client.mchsi.com
173.19.140.67	A+PTR	173-19-140-67.client.mchsi.com
173.19.140.68	A	173-19-140-68.client.mchsi.com
173.19.140.70	A	173-19-140-70.client.mchsi.com
173.19.140.81	A+PTR	173-19-140-81.client.mchsi.com
173.19.140.82	A+PTR	173-19-140-82.client.mchsi.com
173.19.140.83	A+PTR	173-19-140-83.client.mchsi.com
173.19.140.89	A+PTR	173-19-140-89.client.mchsi.com
173.19.140.94	A	173-19-140-94.client.mchsi.com
173.19.140.111	A	173-19-140-111.client.mchsi.com
173.19.140.114	A+PTR	173-19-140-114.client.mchsi.com
173.19.140.115	A+PTR	173-19-140-115.client.mchsi.com
173.19.140.119	A	173-19-140-119.client.mchsi.com
173.19.140.121	A+PTR	173-19-140-121.client.mchsi.com
173.19.140.122	A+PTR	173-19-140-122.client.mchsi.com
173.19.140.132	A	173-19-140-132.client.mchsi.com
173.19.140.136	A+PTR	173-19-140-136.client.mchsi.com
173.19.140.138	A+PTR	173-19-140-138.client.mchsi.com
173.19.140.148	A	173-19-140-148.client.mchsi.com
173.19.140.149	A	173-19-140-149.client.mchsi.com
173.19.140.156	A	173-19-140-156.client.mchsi.com
173.19.140.161	A+PTR	173-19-140-161.client.mchsi.com
173.19.140.163	A+PTR	173-19-140-163.client.mchsi.com
173.19.140.167	A	173-19-140-167.client.mchsi.com
173.19.140.171	A+PTR	173-19-140-171.client.mchsi.com
173.19.140.173	A	173-19-140-173.client.mchsi.com
173.19.140.180	A	173-19-140-180.client.mchsi.com
173.19.140.186	A+PTR	173-19-140-186.client.mchsi.com
173.19.140.190	A	173-19-140-190.client.mchsi.com
173.19.140.192	A+PTR	173-19-140-192.client.mchsi.com
173.19.140.196	A	173-19-140-196.client.mchsi.com
173.19.140.201	A+PTR	173-19-140-201.client.mchsi.com
173.19.140.204	A	173-19-140-204.client.mchsi.com
173.19.140.207	A	173-19-140-207.client.mchsi.com
173.19.140.209	A+PTR	173-19-140-209.client.mchsi.com
173.19.140.211	A+PTR	173-19-140-211.client.mchsi.com
173.19.140.217	A+PTR	173-19-140-217.client.mchsi.com
173.19.140.223	A	173-19-140-223.client.mchsi.com
173.19.140.224	A+PTR	173-19-140-224.client.mchsi.com
173.19.140.229	A	173-19-140-229.client.mchsi.com
173.19.140.230	A	173-19-140-230.client.mchsi.com
173.19.140.236	A	173-19-140-236.client.mchsi.com
173.19.140.241	A+PTR	173-19-140-241.client.mchsi.com
173.19.140.243	A+PTR	173-19-140-243.client.mchsi.com
173.19.140.249	A+PTR	173-19-140-249.client.mchsi.com
173.19.141.1	A+PTR	173-19-141-1.client.mchsi.com
173.19.141.74	A+PTR	173-19-141-74.client.mchsi.com
173.19.141.205	A+PTR	173-19-141-205.client.mchsi.com
173.19.141.205	A	dineencorp.com
173.19.141.235	A+PTR	173-19-141-235.client.mchsi.com
173.19.141.235	A	refranger.com
173.19.142.0	PTR	173-19-142-0.client.mchsi.com
173.19.142.52	A+PTR	173-19-142-52.client.mchsi.com
173.19.142.52	A	marmotski.com
173.19.142.57	PTR	173-19-142-57.client.mchsi.com
173.19.142.64	PTR	173-19-142-64.client.mchsi.com
173.19.142.64	A	wimbawe.com
173.19.142.64	A	cxmega.com
173.19.142.126	A+PTR	173-19-142-126.client.mchsi.com
173.19.143.36	A+PTR	173-19-143-36.client.mchsi.com
173.19.143.250	A+PTR	173-19-143-250.client.mchsi.com
173.19.143.250	A	nwsunset.com
173.19.143.250	A	equineforce.com
173.19.143.254	A+PTR	173-19-143-254.client.mchsi.com