虽然我们许多人熟悉为特定目的或用途分配的各种港口，但我们可能不知道选择这些港口的具体原因。今天的超级用户问答帖子回答了一位好奇的读者的问题。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

图片由Rodney Lewis（Flickr）提供。

问题

超级用户读者Samuel Alexander想知道为什么选择80和443作为默认HTTP和HTTPS端口：

Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port? Is there any particular reason or was it just defined that way?

为什么选择80和443作为默认的HTTP和HTTPS端口？

答案

超级用户贡献者jcbermu为我们提供了答案：

The Internet Assigned Numbers Authority (IANA) is a department of ICANN, a non-profit private corporation that oversees global IP address allocation, the Domain Name System (DNS), well-known ports, and other Internet Protocol-related symbols and numbers.

During March of 1990, they published a document (RFC 1060) where they listed all the well-known ports at that time. In that list there was no protocol assigned to port 80 (it jumped from 79 to 81):

At that time, port 80 was officially free. In 1991, Tim Berners-Lee issued the first version of HTTP in a document (HTTP 0.9) where he stated:

Then in July of 1992, RFC1060 was made obsolete by a new document (RFC 1340) where the following appeared:

That document made 80 the official port for HTTP (www). However there is nothing about port 443 in that document. During October of 1994, RFC 1700 was published and this appeared for the first time:

It seems it was solicited by Kipp E.B. Hickman, who at the time worked at Mosaic, the first GUI browser company that later went on to become Netscape. It is not clear why port 443 was chosen. However, the previous RFC document had a gap from 374 through 512, but in RFC1700 the space from 375 to 451 was filled. It is most likely that the numbers were simply given in order of request.

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