FTP
:21
File Transfer Protocol
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://ipfyi.com/iframe/entity//" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://ipfyi.com/entity//Add a dynamic SVG badge to your README or docs.
[](https://ipfyi.com/entity//)Use the native HTML custom element.
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。