Ftp anonymous

https://www.techtarget.com/whatis/definition/anonymous-FTP-File-Transfer-Protocol

https://stackoverflow.com/questions/3936911/how-can-i-login-anonymously-with-ftp-usr-bin-ftp

https://book.hacktricks.xyz/network-services-pentesting/pentesting-ftp

https://www.ibm.com/docs/SSLTBW_2.4.0/com.ibm.zos.v2r4.halz001/ftpservanonymous.htm

https://henri-demanou.medium.com/exploiting-anonymous-ftp-access-and-ftp-brute-force-dccb07402b15

https://www.ituonline.com/tech-definitions/what-is-ftp-anonymous-access/

https://en.wikipedia.org/wiki/File_Transfer_Protocol

http://lns00.psi.ch/eunix/tasks_ftp2.4.2.1.1.html

https://docs.cpanel.net/cpanel/files/anonymous-ftp/

https://www.rfc-editor.org/rfc/rfc1635.html