40.64.0.0/13

ip:	40.64.0.0 
loc:	India, Jamnagar (Gujarat)  
isp:	AS8075 Microsoft Corporation » Microsoft Corporation » Microsoft Azure Cloud (jioindiawest) 329.219 ms
route:	40.64.0.0/13, MSFT - Microsoft Corporation, IN (Jamnagar) ... 
reg:	40.64.0.0/13, US, ARIN, 2015-02-23
addr:	  One Microsoft Way Redmond WA 98052 US
online:	  33.136 » latency: 106 ms (152ms) 

see also:
   40.64.0.0/15     AS8075   MSFT Microsoft Corporation, US
   40.65.67.0/24    AS8069   MSFT Microsoft Corporation, US
   40.66.0.0/17     AS8075   MSFT Microsoft Corporation, US
   40.67.0.0/16     AS8075   MSFT Microsoft Corporation, US
   40.68.0.0/14     AS8075   MSFT Microsoft Corporation, US