23.239.0.0/19

ip:	23.239.0.0 
loc:	United States, Fremont (California)  
isp:	AS63949 Akamai Connected Cloud » Akamai Technologies, Inc. » Linode 427.103 ms
route:	23.239.0.0/19, AKAMAI - Akamai Technologies, Inc., US (Fremont) ... 
reg:	23.239.0.0/19, US, ARIN, 2013-10-23
addr:	  145 Broadway Cambridge MA 2142 US
online:	  4.161 » latency: 139 ms (138ms) 

see also:
   23.239.0.0/21    AS63949  LINODE Linode, US
   23.239.8.0/21    AS63949  LINODE Linode, US
   23.239.16.0/22   AS63949  LINODE Linode, US
   23.239.20.0/22   AS63949  LINODE Linode, US
   23.239.24.0/22   AS63949  LINODE Linode, US
   23.239.28.0/22   AS63949  LINODE Linode, US