About rfc.dk

rfc.dk is an independent mirror of the RFC series - the documents that define the protocols and practices of the Internet, from RFC 1 in 1969 to the latest publication. It exists to make the series fast to read and easy to search.

What is an RFC?

A Request for Comments is a publication from the RFC Editor, produced by the Internet Engineering Task Force (IETF), the Internet Research Task Force (IRTF), the Internet Architecture Board (IAB) and independent authors. Despite the humble name, RFCs on the standards track are the official specifications of the Internet: TCP, IP, HTTP, TLS, DNS, SMTP and QUIC are all defined in RFCs. Others are informational, experimental, or record best current practice.

How the mirror works

The texts and the metadata index (rfc-index.xml) are fetched from the RFC Editor's official rsync service several times a day. New or changed documents are indexed into a full-text search database and appear on the site immediately after each synchronisation. Nothing is edited: the text you read here is byte for byte what the RFC Editor published. Cross-references to other RFCs and URLs are linked for convenience.

URLs

• /rfc9000/ - RFC 9000 with metadata and the full text
• /rfc9000.txt - the original plain-text file
• /9000, /rfc09000, /rfc9000.html - redirect to the page
• /std/, /bcp/, /fyi/ - the subseries; /bcp14 jumps to BCP 14
• /browse/2021/, /browse/9000-9099/ - lists by year or number range
• /search?q=… - full-text search; /feed.xml - RSS feed of new RFCs

Search

Search covers titles, abstracts, keywords and the complete text of every RFC. Words match as prefixes, phrases can be quoted, and results are ranked with matches in titles weighted highest. Typing a number opens that RFC directly.

Credits and licence

RFCs are copyright their authors and the IETF Trust; see the Trust Legal Provisions. rfc.dk is run privately from Denmark and is not affiliated with the RFC Editor, the IETF or the Internet Society.