Robtex

Up: 72.21.84.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 72.21.84.0/24
Down right: 72.21.85.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.21.84.2	PTR	csw1.lax.edgecastcdn.net
72.21.84.20	PTR	72.21.84.20
72.21.84.78	A	eos019.lax.edgecastcdn.net
72.21.84.79	PTR	dist001.lax.edgecastcdn.net
72.21.84.80	PTR	eos020.lax.edgecastcdn.net
72.21.84.110	A	mon002.lax.edgecastcdn.net
72.21.84.115	A	mdb001.lax.edgecastcdn.net
72.21.84.115	A	csql1.lax.edgecastcdn.net
72.21.84.120	A	web2.lax.edgecastcdn.net
72.21.84.132	PTR	132.84.21.72.in-addr.arpa
72.21.84.132	A	edgecastcdn.com
72.21.84.140	PTR	72.21.84.140
72.21.84.141	PTR	141.84.21.72.in-addr.arpa
72.21.84.141	A	streams.swellnet.com.au
72.21.84.141	A	flo.lax.edgecastcdn.net
72.21.84.143	PTR	72.21.84.143
72.21.84.152	PTR	152.84.21.72.in-addr.arpa
72.21.84.152	A	as15133.net
72.21.84.152	A	as15133.com
72.21.84.190	PTR	190.84.21.72.in-addr.arpa
72.21.84.190	A	ftp.lax.2a78.systemcdn.net
72.21.84.194	PTR	194.84.21.72.in-addr.arpa
72.21.84.199	PTR	nas4.lax.edgecastcdn.net
72.21.84.202	A	nas7.lax.edgecastcdn.net
72.21.84.208	A	nas13.lax.edgecastcdn.net
72.21.84.210	A	nas15.lax.edgecastcdn.net
72.21.84.211	A	nas16.lax.edgecastcdn.net
72.21.84.222	A	ftp1.lax.edgecastcdn.net
72.21.84.224	A	fmo001.lax.edgecastcdn.net
72.21.85.32	PTR	edgecastcdn.net
72.21.85.72	PTR	fmce005.sea.edgecastcdn.net
72.21.85.132	PTR	edgecastcdn.net
72.21.85.132	A	edgecastcdn.com
72.21.85.151	PTR	edgecastcdn.net
72.21.85.159	PTR	edgecastcdn.net
72.21.85.161	PTR	edgecastcdn.net
72.21.85.165	PTR	edgecastcdn.net
72.21.85.182	PTR	edgecastcdn.net
72.21.85.186	PTR	edgecastcdn.net
72.21.85.195	PTR	edgecastcdn.net
72.21.85.197	PTR	edgecastcdn.net
72.21.85.224	PTR	edgecastcdn.net
72.21.85.231	PTR	edgecastcdn.net
72.21.85.235	PTR	edgecastcdn.net