Robtex

Up: 50.83.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 50.83.136.0/22
Down right: 50.83.140.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
50.83.137.1	A+PTR	50-83-137-1.client.mchsi.com
50.83.137.3	A+PTR	50-83-137-3.client.mchsi.com
50.83.137.5	A	50-83-137-5.client.mchsi.com
50.83.137.6	A	leewardassociates.com
50.83.137.8	A+PTR	50-83-137-8.client.mchsi.com
50.83.137.22	A	50-83-137-22.client.mchsi.com
50.83.137.29	A	50-83-137-29.client.mchsi.com
50.83.137.38	A	50-83-137-38.client.mchsi.com
50.83.137.39	A	50-83-137-39.client.mchsi.com
50.83.137.41	A+PTR	50-83-137-41.client.mchsi.com
50.83.137.56	A+PTR	50-83-137-56.client.mchsi.com
50.83.137.61	A	50-83-137-61.client.mchsi.com
50.83.137.62	A	50-83-137-62.client.mchsi.com
50.83.137.67	PTR	50-83-137-67.client.mchsi.com
50.83.137.74	A+PTR	50-83-137-74.client.mchsi.com
50.83.137.75	A+PTR	50-83-137-75.client.mchsi.com
50.83.137.76	A	50-83-137-76.client.mchsi.com
50.83.137.92	A	50-83-137-92.client.mchsi.com
50.83.137.94	A	50-83-137-94.client.mchsi.com
50.83.137.101	A	50-83-137-101.client.mchsi.com
50.83.137.106	A+PTR	50-83-137-106.client.mchsi.com
50.83.137.108	A	50-83-137-108.client.mchsi.com
50.83.137.112	A+PTR	50-83-137-112.client.mchsi.com
50.83.137.122	A+PTR	50-83-137-122.client.mchsi.com
50.83.137.130	A+PTR	50-83-137-130.client.mchsi.com
50.83.137.137	A+PTR	50-83-137-137.client.mchsi.com
50.83.137.139	A+PTR	50-83-137-139.client.mchsi.com
50.83.137.149	A	50-83-137-149.client.mchsi.com
50.83.137.151	A	50-83-137-151.client.mchsi.com
50.83.137.179	A+PTR	50-83-137-179.client.mchsi.com
50.83.137.180	A	50-83-137-180.client.mchsi.com
50.83.137.183	A	50-83-137-183.client.mchsi.com
50.83.137.193	A+PTR	50-83-137-193.client.mchsi.com
50.83.137.194	A+PTR	50-83-137-194.client.mchsi.com
50.83.137.195	A+PTR	50-83-137-195.client.mchsi.com
50.83.137.198	A	50-83-137-198.client.mchsi.com
50.83.137.200	A+PTR	50-83-137-200.client.mchsi.com
50.83.137.207	A	50-83-137-207.client.mchsi.com
50.83.137.212	A	50-83-137-212.client.mchsi.com
50.83.137.214	A	50-83-137-214.client.mchsi.com
50.83.137.216	A+PTR	50-83-137-216.client.mchsi.com
50.83.137.226	A+PTR	50-83-137-226.client.mchsi.com
50.83.137.235	A+PTR	50-83-137-235.client.mchsi.com
50.83.137.238	A	50-83-137-238.client.mchsi.com
50.83.137.243	A+PTR	50-83-137-243.client.mchsi.com
50.83.137.253	A	50-83-137-253.client.mchsi.com
50.83.137.255	A	50-83-137-255.client.mchsi.com
50.83.138.91	A	sifox.com
50.83.138.107	A+PTR	50-83-138-107.client.mchsi.com
50.83.138.141	A+PTR	50-83-138-141.client.mchsi.com
50.83.138.193	A	50-83-138-193.client.mchsi.com
50.83.139.0	A+PTR	50-83-139-0.client.mchsi.com
50.83.139.3	A+PTR	50-83-139-3.client.mchsi.com
50.83.139.7	A	50-83-139-7.client.mchsi.com
50.83.139.27	A+PTR	50-83-139-27.client.mchsi.com
50.83.139.28	A	50-83-139-28.client.mchsi.com
50.83.139.42	A+PTR	50-83-139-42.client.mchsi.com
50.83.139.43	A+PTR	50-83-139-43.client.mchsi.com
50.83.139.45	A	50-83-139-45.client.mchsi.com
50.83.139.63	A	50-83-139-63.client.mchsi.com
50.83.139.64	A+PTR	50-83-139-64.client.mchsi.com
50.83.139.65	A+PTR	50-83-139-65.client.mchsi.com
50.83.139.99	A+PTR	50-83-139-99.client.mchsi.com
50.83.139.100	A	50-83-139-100.client.mchsi.com
50.83.139.101	A	50-83-139-101.client.mchsi.com
50.83.139.103	A	50-83-139-103.client.mchsi.com
50.83.139.111	A	50-83-139-111.client.mchsi.com
50.83.139.116	A	50-83-139-116.client.mchsi.com
50.83.139.127	A	50-83-139-127.client.mchsi.com
50.83.139.136	A+PTR	50-83-139-136.client.mchsi.com
50.83.139.142	A	50-83-139-142.client.mchsi.com
50.83.139.144	A+PTR	50-83-139-144.client.mchsi.com
50.83.139.147	A+PTR	50-83-139-147.client.mchsi.com
50.83.139.150	A	50-83-139-150.client.mchsi.com
50.83.139.151	A	50-83-139-151.client.mchsi.com
50.83.139.154	A+PTR	50-83-139-154.client.mchsi.com
50.83.139.169	A+PTR	50-83-139-169.client.mchsi.com
50.83.139.182	A	50-83-139-182.client.mchsi.com
50.83.139.185	A+PTR	50-83-139-185.client.mchsi.com
50.83.139.188	A	50-83-139-188.client.mchsi.com
50.83.139.189	A	50-83-139-189.client.mchsi.com
50.83.139.190	A	50-83-139-190.client.mchsi.com
50.83.139.193	A+PTR	50-83-139-193.client.mchsi.com
50.83.139.201	A+PTR	50-83-139-201.client.mchsi.com
50.83.139.202	A+PTR	50-83-139-202.client.mchsi.com
50.83.139.202	A	portstrober.com
50.83.139.203	A+PTR	50-83-139-203.client.mchsi.com
50.83.139.208	A+PTR	50-83-139-208.client.mchsi.com
50.83.139.213	A	50-83-139-213.client.mchsi.com
50.83.139.214	A	50-83-139-214.client.mchsi.com
50.83.139.217	A+PTR	50-83-139-217.client.mchsi.com
50.83.139.218	A+PTR	50-83-139-218.client.mchsi.com
50.83.139.221	A	50-83-139-221.client.mchsi.com
50.83.139.232	A+PTR	50-83-139-232.client.mchsi.com
50.83.139.233	A+PTR	50-83-139-233.client.mchsi.com
50.83.139.244	A	50-83-139-244.client.mchsi.com
50.83.139.245	A	50-83-139-245.client.mchsi.com
50.83.139.249	A+PTR	50-83-139-249.client.mchsi.com
50.83.139.252	A	50-83-139-252.client.mchsi.com
50.83.139.255	A	50-83-139-255.client.mchsi.com
50.83.140.46	A	50-83-140-46.client.mchsi.com
50.83.140.150	A	ilovesmallcitysoftware.com
50.83.141.33	PTR	50-83-141-33.client.mchsi.com
50.83.141.33	A	xeppelin.net
50.83.141.33	A	ns2.xeppelin.net
50.83.141.157	A	*.jgillis.com
50.83.141.157	A	cortexcolumbia.com
50.83.141.157	A	mailno.jgillis.com
50.83.142.149	A	50-83-142-149.client.mchsi.com
50.83.143.113	A	50-83-143-113.client.mchsi.com