Robtex

Up: 72.52.48.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 72.52.56.0/22
Down right: 72.52.60.0/22

IP	Type	Hostname
72.52.56.1	PTR	unknown.prolexic.com
72.52.56.2	PTR	unknown.prolexic.com
72.52.56.3	PTR	unknown.prolexic.com
72.52.56.8	PTR	unknown.prolexic.com
72.52.56.9	PTR	unknown.prolexic.com
72.52.56.16	PTR	unknown.prolexic.com
72.52.56.27	PTR	unknown.prolexic.com
72.52.56.34	PTR	unknown.prolexic.com
72.52.56.43	PTR	unknown.prolexic.com
72.52.56.51	PTR	unknown.prolexic.com
72.52.56.59	PTR	unknown.prolexic.com
72.52.56.73	PTR	unknown.prolexic.com
72.52.56.80	PTR	a72-52-56-80.deploy.static.akamaitechnologies.com
72.52.56.81	PTR	unknown.prolexic.com
72.52.56.89	PTR	unknown.prolexic.com
72.52.56.99	PTR	unknown.prolexic.com
72.52.56.192	PTR	unknown.prolexic.com
72.52.56.194	PTR	unknown.prolexic.com
72.52.56.202	PTR	po111.bs-b.sech-tyo.netarch.akamai.com
72.52.57.1	PTR	unknown.prolexic.com
72.52.57.11	PTR	unknown.prolexic.com
72.52.57.64	PTR	unknown.prolexic.com
72.52.57.113	A+PTR	a72-52-57-113.deploy.static.akamaitechnologies.com
72.52.57.114	A+PTR	a72-52-57-114.deploy.static.akamaitechnologies.com
72.52.57.118	A	a72-52-57-118.deploy.static.akamaitechnologies.com
72.52.57.147	PTR	unknown.prolexic.com
72.52.58.0	PTR	lo2358.access-a.sech-tyo.netarch.akamai.com
72.52.58.16	PTR	unknown.prolexic.com
72.52.58.17	PTR	unknown.prolexic.com
72.52.58.41	PTR	unknown.prolexic.com
72.52.58.65	PTR	unknown.prolexic.com
72.52.58.98	PTR	unknown.prolexic.com
72.52.59.2	PTR	unknown.prolexic.com
72.52.59.19	PTR	unknown.prolexic.com
72.52.59.73	PTR	unknown.prolexic.com
72.52.59.74	PTR	unknown.prolexic.com
72.52.59.80	PTR	unknown.prolexic.com
72.52.59.89	PTR	unknown.prolexic.com
72.52.59.99	PTR	unknown.prolexic.com
72.52.59.104	PTR	unknown.prolexic.com
72.52.59.113	PTR	unknown.prolexic.com
72.52.59.152	PTR	unknown.prolexic.com
72.52.59.153	PTR	unknown.prolexic.com
72.52.59.162	PTR	a72-52-59-162.deploy.static.akamaitechnologies.com
72.52.59.232	PTR	unknown.prolexic.com
72.52.60.57	PTR	unknown.prolexic.com
72.52.60.192	PTR	a72-52-60-192.deploy.static.akamaitechnologies.com
72.52.60.200	PTR	unknown.prolexic.com
72.52.60.202	PTR	unknown.prolexic.com
72.52.61.1	PTR	unknown.prolexic.com
72.52.61.24	PTR	unknown.prolexic.com
72.52.61.33	PTR	unknown.prolexic.com
72.52.61.50	PTR	unknown.prolexic.com
72.52.61.99	PTR	unknown.prolexic.com
72.52.61.115	PTR	unknown.prolexic.com
72.52.61.117	A	a72-52-61-117.deploy.static.akamaitechnologies.com
72.52.61.121	PTR	unknown.prolexic.com
72.52.61.122	PTR	unknown.prolexic.com
72.52.61.123	A+PTR	a72-52-61-123.deploy.static.akamaitechnologies.com
72.52.61.124	A	a72-52-61-124.deploy.static.akamaitechnologies.com
72.52.61.147	PTR	unknown.prolexic.com
72.52.61.153	PTR	unknown.prolexic.com
72.52.61.182	A	a72-52-61-182.deploy.static.akamaitechnologies.com
72.52.61.186	PTR	unknown.prolexic.com
72.52.61.203	PTR	unknown.prolexic.com
72.52.63.10	PTR	unknown.prolexic.com
72.52.63.80	PTR	unknown.prolexic.com
72.52.63.186	PTR	ae154-3407.access-a.sech-sin.netarch.akamai.com
72.52.63.195	PTR	a72-52-63-195.deploy.static.akamaitechnologies.com