Access NGINX virtual host in LAN

I want to access a virtual host on a development workstation (Arch Linux) from a mobile device or tablet connected in the same network.

My nginx.conf virtual host spec looks like this:

http {

include mime.types;
default_type application/octet-stream;

sendfile on;
keepalive_timeout 65;
client_max_body_size 16M;

# Domain site1.dev
server {
    server_name site1.dev;
    listen 80;
    root /path/to/dir;

    location / {
        root /path/to/dir;
        index index.php;
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
        fastcgi_pass unix:/run/php-fpm/php-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /path/to/dir/$fastcgi_script_name;
        include fastcgi_params;
    }
}

}

My /etc/hosts file contains:

127.0.0.1    localhost localhost.localdomain site1.dev
192.168.1.11 site1.dev

This works on localhost, but I can't access site1.dev from a phone or tablet connected in the same network. It only works when using the IP address 192.168.1.11. Is there some way to make it work using the site1.dev name ?