166.78.0.0/16

ip:	166.78.0.0 
loc:	United States, Dallas (Texas)  
isp:	AS33070 Rackspace Hosting » Rackspace Hosting » Rackspace Hosting 15.731 ms
route:	166.78.0.0/16, RACKS-8 - Rackspace Hosting, US (Dallas) ... 
reg:	166.78.0.0/16, US, ARIN, 2012-10-17
addr:	  1718 Dry Creek Way Ste 115 San Antonio TX 78259-1837 US
online:	  3.248 » latency: 131 ms (122ms) 

see also:
   166.78.0.0/18    AS33070  RACKS-8-NET-11 Rackspace Hosting, US
   166.78.64.0/18   AS19994  RACKS-8-NET-11 Rackspace Hosting, US
   166.78.128.0/18  AS33070  RACKS-8-NET-11 Rackspace Hosting, US
   166.78.192.0/18  AS19994  RACKS-8-NET-11 Rackspace Hosting, US