from http://www.rfc-editor.org/download.html:

  Downloading RFC Collections Using FTP

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            Download/Update collection using *rsync*

      The RFC Editor supports the *rsync* program, which can efficiently
      maintain a local copy of various subsets of the RFC Editor's
      repository in sync with the official copy. The How-To document
      <http://www.rfc-editor.org/rsync-help.html> explains how to
      specify the desired subset of the repository, using a template
      called a /module/ by *rsync*.

            Download Collections using FTP

      You can download the entire collection of RFCs or various subsets,
      in either .tar.gz format for Unix systems or .zip format for
      Windows. Pay attention to the approximate sizes shown: some of
      these are BIG files.

          o Entire RFC Collection: .tar.gz <RFC-all.tar.gz> or Zipped
	    <RFC-all.zip> format.  These files are updated once a
	    week.

          o RFCs 1-500: .tar.gz <RFCs0001-0500.tar.gz> or Zipped
            <RFCs0001-0500.zip> format. 7MB.

          o RFCs 501-1000: .tar.gz <RFCs0501-1000.tar.gz> or Zipped
	    <RFCs0501-1000.zip> format. 5MB.

          o RFCs 1001-1500: .tar.gz <RFCs1001-1500.tar.gz> or Zipped
	    <RFCs1001-1500.zip> format. 13MB.

          o RFCs 1501-2000: .tar.gz <RFCs1501-2000.tar.gz> or Zipped
	    <RFCs1501-2000.zip> format. 8MB.

          o RFCs 2001-2500: .tar.gz <RFCs2001-2500.tar.gz> or Zipped
	    <RFCs2001-2500.zip> format. 8MB.

          o RFCs 2501-3000: .tar.gz <RFCs2501-3000.tar.gz> or Zipped
	    <RFCs2501-3000.zip> format. 10MB.

          o RFCs 3001-latest: .tar.gz <RFCs3001-latest.tar.gz> or
	    Zipped <RFCs3001-latest.zip> format. (variable)

      The primary version of every RFC is encoded as an ASCII text file,
      which was once the Lingua Franca of the computer world. However,
      users of *Microsoft Windows* often have difficulty displaying
      vanilla ASCII text files with the correct pagination. To meet this
      need, the RFC Editor provides a PDF encoded version of every RFC.
      You can download the entire collection of these RFCs or various
      subsets in either .tar.gz or .zip format.

          o Entire PDF-formatted RFC Collection: .tar.gz
	    <pdfrfc-all.tar.gz> or Zipped <pdfrfc-all.zip> format. 70-75MB.

	  o PDF-formatted RFCs 1-500: .tar.gz <pdfrfc0001-0500.tar.gz> or
	    Zipped <pdfrfc0001-0500.zip> format. 2MB.

	  o PDF-formatted RFCs 501-1000: .tar.gz <pdfrfc0501-1000.tar.gz>
	    or Zipped <pdfrfc0501-1000.zip> format. 6MB.

	  o PDF-formatted RFCs 1001-1500: .tar.gz <pdfrfc1001-1500.tar.gz>
	    or Zipped <pdfrfc1001-1500.zip> format. 12MB.

	  o PDF-formatted RFCs 1501-2000: .tar.gz <pdfrfc1501-2000.tar.gz>
	    or Zipped <pdfrfc1501-2000.zip> format. 11MB.

	  o PDF-formatted RFCs 2001-2500: .tar.gz <pdfrfc2001-2500.tar.gz>
	    or Zipped <pdfrfc2001-2500.zip> format. 13MB.

	  o PDF-formatted RFCs 2501-3000: .tar.gz <pdfrfc2501-3000.tar.gz>
	    or Zipped <pdfrfc2501-3000.zip> format. 14MB.

	  o PDF-formatted RFCs 3001-latest: .tar.gz
	    <pdfrfc3001-latest.tar.gz> or Zipped <pdfrfc3001-latest.zip>
	    format. (variable)

      In addition, the directory
      <ftp://ftp.rfc-editor.org/in-notes/tar/> contains compressed tar
      files (.tar.gz) and zip (.zip) files containing all RFCs that
      changed in the last 30 days and in the last 7 days. These summary
      files have names "30daysTo..." and "7daysTo..." and are updated
      weekly.

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        RFC Editor home page. <http://www.rfc-editor.org>

        Last modified 05-January-2003.