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From this post we know that

There are two common modes for transferring files via FTP, ascii and binary

It is about media connection. But also there is a control connection, which has some info like IP addresses and so on.
Does the info inside control connection have binary or textual format?

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  • Have you researched the relevant RFCs which define the FTP protocol? – user1686 Mar 24 '20 at 21:05
  • @user1686 I'm currently researching it but can't still figure out things. – z0lupka Mar 24 '20 at 21:05
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    Short answer: text – DavidPostill Mar 24 '20 at 21:07
  • @DavidPostill Thank you so much! – z0lupka Mar 24 '20 at 21:09
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The FTP control connection is text. It's mostly 4-character all-caps command mnemonics and occasional IP addresses (in dotted-decimal ASCII) and port numbers (in ASCII numerals). And of course path and file names in text.

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    It's not just that it's text – but it's also specifically defined to be NVT-ASCII text with CRLF line endings, so it's exactly the same as "ASCII" data transfer mode. – user1686 Mar 25 '20 at 8:25

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