In addition to searching, you can browse and download RFCs as follows.
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See RFC 6410 for more information regarding maturity levels.
Here are details for using rsync to efficiently maintain a local copy of various subsets of the RFC Editor’s repository in sync with the official copy.
RFCs are available in files of 500 documents; please see this listing of TAR and ZIP files.
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[This list is not comprehensive. It is experimental; it relies on search by title and keyword.]