3.168.91.0/24

ip:	3.168.91.0 server-3-168-91-0.sfo5.r.cloudfront.net
loc:	United States, San Jose (California)  
isp:	AS16509 Amazon.com, Inc. » Amazon.com, Inc. » AWS CloudFront (GLOBAL) 308.749 ms
route:	3.168.91.0/24, AMAZON-CF - Amazon.com, Inc., US (San Jose) ... 
reg:	3.128.0.0/9, US, ARIN, 2018-06-25
asn:	AS16509 - AMAZON-02 Amazon.com Inc., US
addr:	  1918 8th Ave SEATTLE WA 98101-1244 US
online:	  39 » latency: 163 ms (163ms) 

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