FTP, SFTP and Other File Transfer Protocols

FTP client issues PASV command and FTP server responds with “227 Entering Passive Mode (213,229,112,130,216,4)”. 213,229,112,130 is IP address. 216 is upper 8bits in decimal. 4 is lower 8bits in decimal. So port number is 216 * 256 + 4. You should parse them in bracket.