Robtex

Up: 72.52.48.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.52.48.0/23
Down right: 72.52.50.0/23

IP	Type	Hostname
72.52.48.1	PTR	unknown.prolexic.com
72.52.48.19	PTR	unknown.prolexic.com
72.52.48.47	PTR	unknown.prolexic.com
72.52.48.72	PTR	unknown.prolexic.com
72.52.48.93	PTR	unknown.prolexic.com
72.52.48.197	PTR	ae120.access-a.sech-fra.netarch.akamai.com
72.52.48.200	PTR	po110.bs-b.sech-fra.netarch.akamai.com
72.52.48.205	PTR	a72-52-48-205.deploy.static.akamaitechnologies.com
72.52.48.207	PTR	ae121.access-b.sech-fra.netarch.akamai.com
72.52.48.235	PTR	unknown.prolexic.com
72.52.49.0	PTR	unknown.prolexic.com
72.52.49.1	PTR	unknown.prolexic.com
72.52.49.11	PTR	unknown.prolexic.com
72.52.49.68	PTR	unknown.prolexic.com
72.52.49.88	PTR	unknown.prolexic.com
72.52.49.101	PTR	unknown.prolexic.com
72.52.49.107	PTR	unknown.prolexic.com
72.52.49.113	PTR	unknown.prolexic.com
72.52.49.114	A+PTR	a72-52-49-114.deploy.static.akamaitechnologies.com
72.52.49.115	A+PTR	a72-52-49-115.deploy.static.akamaitechnologies.com
72.52.49.116	PTR	unknown.prolexic.com
72.52.49.117	PTR	unknown.prolexic.com
72.52.49.118	A+PTR	a72-52-49-118.deploy.static.akamaitechnologies.com
72.52.49.121	PTR	unknown.prolexic.com
72.52.49.122	PTR	unknown.prolexic.com
72.52.49.124	PTR	unknown.prolexic.com
72.52.49.125	PTR	unknown.prolexic.com
72.52.49.146	PTR	unknown.prolexic.com
72.52.49.150	PTR	unknown.prolexic.com
72.52.49.153	PTR	unknown.prolexic.com
72.52.49.178	PTR	unknown.prolexic.com
72.52.50.2	PTR	unknown.prolexic.com
72.52.50.5	PTR	unknown.prolexic.com
72.52.50.7	PTR	lo1417.access-a.sech-fra.netarch.akamai.com
72.52.50.11	PTR	lo1428.access-a.sech-fra.netarch.akamai.com
72.52.50.15	PTR	lo3374.access-a.sech-fra.netarch.akamai.com
72.52.50.21	PTR	unknown.prolexic.com
72.52.50.26	PTR	lo3258.access-a.sech-fra.netarch.akamai.com
72.52.50.43	PTR	lo4159.access-a.sech-fra.netarch.akamai.com
72.52.50.49	PTR	unknown.prolexic.com
72.52.50.68	PTR	unknown.prolexic.com
72.52.50.70	PTR	unknown.prolexic.com
72.52.50.72	PTR	unknown.prolexic.com
72.52.50.81	PTR	unknown.prolexic.com
72.52.50.91	PTR	unknown.prolexic.com
72.52.50.92	PTR	a72-52-50-92.deploy.static.akamaitechnologies.com
72.52.50.99	PTR	a72-52-50-99.deploy.static.akamaitechnologies.com
72.52.50.131	PTR	ip1920.access-a.sech-fra.netarch.akamai.com
72.52.50.155	PTR	ip2301.access-a.sech-fra.netarch.akamai.com
72.52.50.167	PTR	lo4211.access-a.sech-fra.netarch.akamai.com
72.52.50.179	PTR	ip3752.access-a.sech-fra.netarch.akamai.com
72.52.50.197	PTR	unknown.prolexic.com
72.52.50.226	PTR	lo4442.access-a.sech-fra.netarch.akamai.com
72.52.51.31	PTR	unknown.prolexic.com
72.52.51.69	PTR	unknown.prolexic.com
72.52.51.115	PTR	unknown.prolexic.com
72.52.51.205	PTR	unknown.prolexic.com
72.52.51.226	PTR	unknown.prolexic.com