64.49.192.0/18

ip:	64.49.192.0 
loc:	United States, Dallas (Texas)  
isp:	AS33070 Rackspace Hosting » Rackspace Hosting » Communicom Inc. 630.914 ms
route:	64.49.192.0/18, RACKS-8 - Rackspace Hosting, US (Dallas) ... 
reg:	64.49.192.0/18, US, ARIN, 2001-03-27
addr:	  1718 Dry Creek Way Ste 115 San Antonio TX 78259-1837 US
online:	  301 » latency: 128 ms (106ms) 

see also:
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   64.49.234.0/23   AS33070  RSPC-NET-3 Rackspace Hosting, US
   64.49.236.0/22   AS33070  RSPC-NET-3 Rackspace Hosting, US
   64.49.240.0/20   AS33070  RSPC-NET-3 Rackspace Hosting, US