Require Text-Based URL for FTP Access

All: Would like to know if there is a way to require that access via FTP be via a text based URL instead of an IP based URL. For example, many malware exploits have a built in FTP client that will transfer its reconnaissance data via an IP instead of a domain name or full FTP URL string. So, instead of allowing ftp://10.1.2.3 outbound, would like to stop it in its tracks as it breaks the desired formatting. If the GW sees something like ftp://support.dell.com, then I allow this through. Or if there is a way to require reverse DNS as many of these exploits with an FTP client do not resolve to any DNS records like an A record or CNAME. Internally, we do have various FTP servers that we only use an IP statement in the session but I can set those to static bypass or an exception in the scanning bypass. Need to know if this is possible and if so, how to accomplish.