3.172.20.0/24

ip:	3.172.20.0 
loc:	United States, Seattle (Washington)  
isp:	AS16509 Amazon.com, Inc. » Amazon.com, Inc. » AWS CloudFront Origin Facing (GLOBAL) 366.966 ms
route:	3.172.20.0/24, AT-88-Z - Amazon Technologies Inc., US (Chicago) ... 
reg:	3.128.0.0/9, US, ARIN, 2018-06-25
asn:	AS16509 - AMAZON-02 Amazon.com Inc., US
addr:	  410 Terry Ave N. Seattle WA 98109 US
online:	  80 » latency: 161 ms (161ms) 

see also:
   3.128.0.0/10     AS16509  AT-88-Z Amazon Technologies Inc., US