52.122.4.0/23

ip:	52.122.4.0 
loc:	United States, Boydton (Virginia)  
isp:	AS8069 Microsoft Corporation » Microsoft Corporation » Microsoft Azure Cloud (eastus) 330.854 ms
route:	52.122.4.0/23, MSFT - Microsoft Corporation, US (Washington) ... 
reg:	52.120.0.0/14, US, ARIN, 2015-11-24
asn:	AS8069 - MICROSOFT-CORP-MSN-AS-BLOCK Microsoft Corporation, US
	  AS1299  - TWELVE99 Arelion, f/k/a Telia Carrier, SE
addr:	  One Microsoft Way Redmond WA 98052 US
online:	  3 » latency: 118 ms (118ms) 

see also:
   52.120.0.0/14    AS8075   MSFT Microsoft Corporation, US