Robtex

Up: 23.63.128.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 23.63.136.0/22
Down right: 23.63.140.0/22

IP	Type	Hostname
23.63.136.26	A+PTR	a23-63-136-26.deploy.static.akamaitechnologies.com
23.63.137.29	A+PTR	a23-63-137-29.deploy.static.akamaitechnologies.com
23.63.138.172	A	a23-63-138-172.deploy.akamaitechnologies.com
23.63.138.240	PTR	a23-63-138-240.deploy.static.akamaitechnologies.com
23.63.138.242	PTR	a23-63-138-242.deploy.static.akamaitechnologies.com
23.63.139.27	A+PTR	a23-63-139-27.deploy.static.akamaitechnologies.com
23.63.139.46	A+PTR	a23-63-139-46.deploy.static.akamaitechnologies.com
23.63.143.255	PTR	a23-63-143-255.deploy.static.akamaitechnologies.com