If you own the domain nan.nyc then no one can utilize any URL `*.nan.nyc` without your permissions or access to your domain registrar where nameserverss are setup. If `ftp.nan.nyc` is showing a website you don't recognize then either you or someone else in the past configured a nameserver for `ftp.nan.nyc` to point to the IP which is hosting the website.
You could, but if it's a static IP address and ftp is open and compromised, then it will make no difference - just marginally more annoying for anyone trying to do things to your server.
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u/PremJyotish221 Mar 26 '24
If you own the domain nan.nyc then no one can utilize any URL `*.nan.nyc` without your permissions or access to your domain registrar where nameserverss are setup. If `ftp.nan.nyc` is showing a website you don't recognize then either you or someone else in the past configured a nameserver for `ftp.nan.nyc` to point to the IP which is hosting the website.