Robtex

Up: 23.198.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 23.198.4.0/25
Down right: 23.198.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
23.198.4.2	PTR	a23-198-4-2.deploy.static.akamaitechnologies.com
23.198.4.39	PTR	a23-198-4-39.deploy.static.akamaitechnologies.com
23.198.4.53	A+PTR	a23-198-4-53.deploy.static.akamaitechnologies.com
23.198.4.98	PTR	a23-198-4-98.deploy.static.akamaitechnologies.com
23.198.4.131	A	cid-cba2781d26bd6ea9.spaces.live.com
23.198.4.131	A	cid-800eb93c9325f4ed.spaces.live.com
23.198.4.131	A	*.111.8-static.reverse.sleepbetteratnight.spaces.live.com
23.198.4.137	A+PTR	a23-198-4-137.deploy.static.akamaitechnologies.com
23.198.4.194	A	e9901.g.akamaiedge.net