52.122.72.0/21

ip:	52.122.72.0 
loc:	Ireland, Dublin (Leinster)  
isp:	AS8069 Microsoft Corporation » Microsoft Corporation » Microsoft Azure Cloud (northeurope) 380.367 ms
route:	52.122.72.0/21, MSFT - Microsoft Corporation, IE (DUBLIN) ... 
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:	  167 » latency: 48 ms (49ms) 

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