3.161.238.0/23

ip:	3.161.238.0 server-3-161-238-0.dfw57.r.cloudfront.net
loc:	United States, Dallas (Texas)  
isp:	AS16509 Amazon.com, Inc. » Amazon.com, Inc. » AWS CloudFront (GLOBAL) 323.065 ms
route:	3.161.238.0/23, AMAZON-CF - Amazon.com, Inc., US ... 
reg:	3.128.0.0/9, US, ARIN, 2018-06-25
asn:	AS16509 - AMAZON-02 Amazon.com Inc., US
addr:	  
online:	  508 » latency: 136 ms (136ms) 

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