# rfc.dk

> Complete, searchable mirror of the RFC series (Request for Comments) published by the RFC Editor: 9,836 documents from RFC 1 (1969) through RFC 10042, full text, synchronised from rsync.rfc-editor.org every 6 hours. Independent and not affiliated with the RFC Editor, the IETF or the Internet Society; texts are reproduced verbatim.

RFC numbers in URLs are not zero-padded (/rfc791/, not /rfc0791/; padded forms redirect). Every page sends ETag and Last-Modified and answers conditional requests with 304. Status values used throughout: Internet Standard, Draft Standard, Proposed Standard, Best Current Practice, Informational, Experimental, Historic, Unknown. The authoritative source for RFCs and their errata is the RFC Editor.

## Documents

- [RFC page, e.g. RFC 9000](https://rfc.dk/rfc9000/): metadata (status, authors, date, stream, working group, obsoletes/obsoleted by/updates/updated by, errata, DOI, citation counts), abstract, and the full text with section anchors (#section-4.2, #appendix-A) and cross-references linked; append ?q=words to highlight terms
- [Cited by, e.g. RFC 9000](https://rfc.dk/rfc9000/cited-by/): RFCs whose text mentions this one (pattern /rfcN/cited-by/); [cites](https://rfc.dk/rfc9000/cites/) lists the RFCs it mentions
- [Plain text, e.g. rfc9000.txt](https://rfc.dk/rfc9000.txt): the original file exactly as published (pattern /rfcN.txt)
- [Metadata as JSON, e.g. rfc9000.json](https://rfc.dk/rfc9000.json): number, title, authors, published, status, stream, working_group, abstract, keywords, doi, obsoletes, obsoleted_by, updates, updated_by, is_also, urls; CORS enabled (pattern /rfcN.json)

## Search and browse

- [Full-text search](https://rfc.dk/search?q=congestion+control): titles, abstracts, keywords and texts. Syntax: words (prefix match when 5+ letters), "quoted phrase", a OR b, -excluded, title:/abstract:/keyword:word, author:name, wg:acronym, area:acronym, stream:name, status:name, year:2021 or year:2019-2021. Parameters: status=proposed-standard, stream=IETF, obsolete=hide, sort=date or number, p=page
- [Search results as JSON](https://rfc.dk/search?q=quic&format=json): same query language, results with number, title, status, published, authors, snippet and URLs, plus facet counts; CORS enabled
- [Browse](https://rfc.dk/browse/): by year, number range and status
- [RFCs by year, e.g. 2021](https://rfc.dk/browse/2021/): pattern /browse/YEAR/
- [RFCs by number range, e.g. 9000-9099](https://rfc.dk/browse/9000-9099/): pattern /browse/LO-HI/
- [RFCs by status, e.g. Proposed Standard](https://rfc.dk/status/proposed-standard/): pattern /status/SLUG/
- [Internet Standards (STD)](https://rfc.dk/std/): every STD number and its RFCs
- [Best Current Practices (BCP)](https://rfc.dk/bcp/): every BCP number and its RFCs
- [FYI series](https://rfc.dk/fyi/): the historic FYI subseries
- [Working groups](https://rfc.dk/wg/): every IETF working group with RFCs (pattern /wg/ACRONYM/)
- [Areas](https://rfc.dk/area/): IETF areas (pattern /area/ACRONYM/)
- [Authors](https://rfc.dk/author/): every author, A-Z by surname (pattern /author/SLUG/, e.g. /author/j-postel/)
- [Search help](https://rfc.dk/help/): the full query syntax with examples

## Feeds and index files

- [RSS feed](https://rfc.dk/feed.xml): newly published RFCs
- [Sitemap](https://rfc.dk/sitemap.xml): every page with last-modified dates
- [rfc-index.txt](https://rfc.dk/rfc-index.txt): the RFC Editor's text index
- [rfc-index.xml](https://rfc.dk/rfc-index.xml): the RFC Editor's XML index with full metadata

## About

- [About rfc.dk](https://rfc.dk/about/): how the mirror works, URL scheme, contact
- [RFC Editor](https://www.rfc-editor.org/): the authoritative publisher of the series