Why is my amazon EC2 in asian pacific region having a US ip address?

I recently give a free trial to amazon EC2 service, I created a free tier micro instance(AMI is windows server 2008) in the Asian Pacific(Tokyo) region, but when it's done the public DNS it provided is ec2-54-238-181-35.ap-northeast-1.compute.amazonaws.com.

The corresponding IP is 54.238.181.35, which I think is in the U.S. I tried to allocate some more elastic IPs but all of them seem to have a U.S. origin.

Anyone please help explain to me ?

http://www.ip2location.com/demo shows that IP as being in Tokyo, Japan.

ap-northeast-1 is Japan (Amazon's first Asia-Pacific North-East datacenter), and you can't reliably determine where a global organization's IP space is actually pointing. A traceroute on the IP shows it passing through IPs in the right region.

Because it is registered to Amazon?

IP Address Country Code Location Postal Code Coordinates ISP Organization Domain Metro Code 54.238.181.35 US Seattle, Washington, United States, North America 98109 47.6344, -122.3422 Amazon Technologies Amazon.com 819