Port 21 TCP is a well known port used for the control connection of the FTP (FTP also uses 20 for the data connection) protocol.
in:
Recent changes
2401:4900:1F2A:8FFF:0:0:19A:5EFE • 1 month ago
Harsharose • 1 month ago
Harsharose • 1 month ago
2607:FB90:EAC3:85A9:897A:CA2C:7CC3:E11B • 2 months ago