199.96.56.0/21

ip:	199.96.56.0 
loc:	United States, San Francisco (California)  
isp:	AS13414 Twitter Inc. » Twitter Inc. » Twitter Inc. 129.326 ms
route:	199.96.56.0/21, TWITT - Twitter Inc., US (San Francisco (South of Market)) ... 
reg:	199.96.56.0/21, US, ARIN, 2012-02-01
addr:	  1355 Market Street Suite 900 San Francisco CA 94103 US
online:	  844 » latency: 125 ms (125ms) 

see also:
   199.96.56.0/23   AS13414  TWITTER-NETWORK Twitter Inc., US