3.0.0.0/15

ip:	3.0.0.0 ec2-3-0-0-0.ap-southeast-1.compute.amazonaws.com
loc:	Singapore, Singapore (Central Singapore)  
isp:	AS16509 Amazon.com, Inc. » Amazon Technologies Inc. » AWS EC2 (ap-southeast-1) 142.185 ms
route:	3.0.0.0/15, AMAZON-SIN - Amazon Data Services Singapore, SG (Singapore) ... 
reg:	3.0.0.0/9, US, ARIN, 2017-12-20
asn:	AS16509 - AMAZON-02 Amazon.com Inc., US
addr:	  Bedok Central Post Office PO Box 482 Singapore 49481 SG
online:	  9.226 » latency: 290 ms (286ms) 

see also:
   3.0.0.0/10       AS16509  AT-88-Z Amazon Technologies Inc., US