23.0.0.0/12

ip:	23.0.0.0 a23-0-0-0.deploy.static.akamaitechnologies.com
loc:	United States, Cambridge (Massachusetts)  
isp:	AS20940 Akamai International B.V. » Akamai International B.V. » Akamai Technologies, Inc. 152.444 ms
route:	23.0.0.0/12, AKAMAI - Akamai Technologies, Inc., US (Cambridge (Area 2/MIT)) ... 
reg:	23.0.0.0/12, US, ARIN, 2010-12-17
asn:	AS20940 - AKAMAI-ASN1 Akamai International B.V., NL
addr:	  145 Broadway Cambridge MA 2142 US
online:	  951.119 » latency: 175 ms (213ms) 

see also:
   23.0.0.0/24      AS20940  AKAMAI Akamai Technologies, Inc., US
   23.0.16.0/20     AS16625  AKAMAI Akamai Technologies, Inc., US
   23.0.88.0/21     AS16625  AKAMAI Akamai Technologies, Inc., DE
   23.0.144.0/20    AS12252  AKAMAI Akamai Technologies, Inc., PE
   23.0.160.0/24    AS20940  AKAMAI Akamai Technologies, Inc., IN
   23.0.161.0/24    AS20940  AIBV Akamai International, BV, NO
   23.0.162.0/24    AS20940  AKAMAI Akamai Technologies, Inc., US
   23.0.163.0/24    AS20940  AKAMAI Akamai Technologies, Inc., US
   23.0.168.0/22    AS16625  AKAMAI Akamai Technologies, Inc., ID
   23.0.172.0/23    AS16625  AKAMAI Akamai Technologies, Inc., ID
   23.0.174.0/24    AS20940  AIBV Akamai International, BV, CH
   23.0.175.0/24    AS20940  AKAMAI Akamai Technologies, Inc., US
   23.0.176.0/20    AS16625  AKAMAI Akamai Technologies, Inc., ID
   23.0.192.0/22    AS16625  AKAMAI Akamai Technologies, Inc., US
   23.0.204.0/22    AS16625  AKAMAI Akamai Technologies, Inc., US
   23.0.212.0/22    AS16625  AIBV Akamai International, BV, NL
   23.0.220.0/22    AS16625  AKAMAI Akamai Technologies, Inc., MY
   23.0.232.0/21    AS12252  AKAMAI Akamai Technologies, Inc., PE
   23.0.240.0/22    AS16625  AKAMAI Akamai Technologies, Inc., IN