Yes, it shows the previous IP. Here is what it shows:

Thank you for using DigitalOcean's Django Application. 
We have created a default Django application that can be seen from http://104.131.72.215/ 
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You can use the following SFTP credentials to upload your files (using FileZilla/WinSCP/Rsync): 
Host: 104.131.72.215 
User: django

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Nginx listens on public IP (104.131.72.215) port 80 and forwards requests to Gunicorn on port 9000 
Nginx access log is in /var/log/nginx/access.log and error log is in /var/log/nginx/error.log 
Gunicorn is started using an Upstart script located at /etc/init/gunicorn.conf 
To restart your Django project, run : sudo service gunicorn restart

But, my new IP is http://104.131.181.48/ .

Right, that’s just a text file that is created when the droplet first booted. Your snapshot copies all of the files from the original droplet exactly. So that’s why the old information is there, but that file is only used to display that information not anything system critical. If visiting http://104.131.181.48/ doesn’t show anything, then you probably have a problem somewhere else. Is there anything in /var/log/nginx/error.log ?

/var/log/nginx/error.log contains below lines:

2014/10/27 09:40:05 [emerg] 971#0: unknown directive "base" in /etc/nginx/sites-enabled/django:10 
2014/10/27 09:45:05 [emerg] 945#0: unknown directive "base" in /etc/nginx/sites-enabled/django:10 

Contents of file /etc/nginx/sites-enabled/django, last line is one with error :

upstream app_server { 
server 127.0.0.1:9000 fail_timeout=0; 
}

server { 
listen 80 default_server; 
listen [::]:80 default_server ipv6only=on;

root /usr/share/nginx/html; 
base base.html base.htm;

I hads changed this line from ‘index index.html index.htm;’ to 'base base.html base.htm;’, but it worked just fine in the previous droplet. I have changed it back to default but still its not working.

The index directive “sets the default file to serve if a directory is requested by the client” (Nginx doc link). You can specify that file to have a different name, but the line still needs to start with index So you want something like:

   root /usr/share/nginx/html;
   index base.html base.htm;

Ok. I have changed it back to above line. Also, I had opened up support ticket regarding the same and from there I got to know that nginx was not running. I started it with “service nginx start” and now everything is working fine. Thanks for the help :)