What is File Transfer Protocol?

File Transfer Protocol (FTP) is a Application Layer protocol in the File Transfer category. Standard protocol for transferring files between hosts. Uses separate control (port 21) and data (port 20) connections.

What port does FTP use?

FTP uses port 20, 21 by default. The protocol is defined in RFC 959.

FTP :21

File Transfer Protocol

Application Layer — File Transfer

协议概览

全称 File Transfer Protocol

缩写 FTP

OSI 层 Application Layer

类别 File Transfer

默认端口 20, 21

RFC RFC 959

关于 FTP

Standard protocol for transferring files between hosts. Uses separate control (port 21) and data (port 20) connections.

Application Layer File Transfer 端口 20, 21

标准参考

FTP定义于互联网工程任务组（IETF）发布的RFC 959中。RFC是互联网协议的官方标准文档，可免费公开查阅。

File Transfer Protocol

协议概览

关于 FTP

标准参考

相关协议 — Application Layer