Robtex

Up: 72.52.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.52.28.0/23
Down right: 72.52.30.0/23

IP	Type	Hostname
72.52.28.52	PTR	unknown.prolexic.com
72.52.28.60	PTR	unknown.prolexic.com
72.52.28.91	PTR	unknown.prolexic.com
72.52.28.106	PTR	a72-52-28-106.deploy.static.akamaitechnologies.com
72.52.28.159	PTR	unknown.prolexic.com
72.52.28.171	PTR	unknown.prolexic.com
72.52.28.178	PTR	unknown.prolexic.com
72.52.28.208	PTR	unknown.prolexic.com
72.52.28.241	PTR	unknown.prolexic.com
72.52.30.26	PTR	unknown.prolexic.com
72.52.30.62	PTR	unknown.prolexic.com
72.52.30.97	PTR	unknown.prolexic.com
72.52.30.177	PTR	unknown.prolexic.com
72.52.31.112	PTR	unknown.prolexic.com
72.52.31.136	PTR	unknown.prolexic.com
72.52.31.179	PTR	unknown.prolexic.com
72.52.31.201	PTR	unknown.prolexic.com
72.52.31.238	PTR	unknown.prolexic.com