I used to have the domain cirrostratusco.com, hosted at Rackspace.
My new IP at Digital Ocean, 104.131.153.79, is redirecting to cirrostratusco.com even though that's not an entry in my Nginx setup, my domain list or even a domain I own.
I've grepped over the entire machine for references to cirrostratuso.com, and the only references I can find are in the logs of failed access to cirrostratusco.com
It is where I'm accessing the internet. I'll contact the folks that control DNS where I'm at and go from there.
It has nothing to do with DNS, you're accessing the IP directly.
Wouters-MacBook-Air:~ Woet$ curl -i 104.131.153.79
HTTP/1.1 200 OK
Server: nginx/1.10.0 (Ubuntu)
Date: Thu, 20 Oct 2016 19:54:50 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 127
Connection: keep-alive
Vary: Accept-Encoding
Cache-Control: must-revalidate
{"couchdb":"Welcome","uuid":"ee7c051e78c1bc9ea2b454583b189d0a","version":"1.6.1","vendor":{"name":"Ubuntu","version":"16.04"}}