Robtex

Up: 170.133.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 170.133.128.0/20
Down right: 170.133.144.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
170.133.133.18	A	mta3mcs117.webex.com
170.133.135.29	PTR	mny4mcs355.webex.com
170.133.135.211	PTR	m71nymcs108.webex.com
170.133.136.25	A+PTR	ectcb121.webex.com
170.133.140.17	A+PTR	escb174.webex.com
170.133.140.21	A+PTR	escb176.webex.com
170.133.140.29	A+PTR	escb180.webex.com
170.133.150.132	A	linus1.cmr-aiadm-b-1.prod.infra.webex.com
170.133.150.132	A	linus6.cmr-aiadm-b-1.prod.infra.webex.com
170.133.150.132	A	linus22.cmr-aiadm-b-1.prod.infra.webex.com
170.133.150.167	A	linus3.cmr-aiadm-b-1.prod.infra.webex.com
170.133.150.167	A	linus12.cmr-aiadm-b-1.prod.infra.webex.com
170.133.150.167	A	linus28.cmr-aiadm-b-1.prod.infra.webex.com
170.133.152.12	A+PTR	msj8mcs230.webex.com
170.133.152.13	A+PTR	msj8mcs231.webex.com
170.133.152.14	A+PTR	msj8mcs232.webex.com
170.133.152.15	A+PTR	msj8mcs233.webex.com
170.133.152.32	A+PTR	msj8mcs250.webex.com
170.133.152.33	A+PTR	msj8mcs251.webex.com
170.133.152.34	A+PTR	msj8mcs252.webex.com
170.133.152.35	A+PTR	msj8mcs253.webex.com
170.133.152.69	A+PTR	msj7mcs256.webex.com
170.133.152.71	A+PTR	msj7mcs258.webex.com
170.133.152.72	A+PTR	msj7mcs259.webex.com
170.133.152.75	PTR	msj7mcs248.webex.com
170.133.152.76	A	msj7mcs249.webex.com
170.133.152.128	A+PTR	msj4mcs230.webex.com
170.133.152.129	A+PTR	msj4mcs231.webex.com
170.133.152.130	A+PTR	msj4mcs232.webex.com
170.133.152.131	A+PTR	msj4mcs233.webex.com
170.133.152.160	A+PTR	msj4mcs262.webex.com
170.133.152.161	A+PTR	msj4mcs263.webex.com
170.133.152.162	A+PTR	msj4mcs264.webex.com
170.133.152.166	A+PTR	msj4mcs292.webex.com
170.133.152.192	A+PTR	msj4mcs285.webex.com
170.133.152.193	A+PTR	msj4mcs286.webex.com
170.133.152.194	A+PTR	msj4mcs287.webex.com
170.133.152.195	A+PTR	msj4mcs288.webex.com
170.133.153.13	A+PTR	msj14mcs166.webex.com
170.133.153.21	PTR	msj14mcs176.webex.com
170.133.153.180	PTR	msj14mcs307.webex.com