The OpenBSD 2.1 Release:

The most recent OpenBSD release is 2.1. You can find these files in OpenBSD/2.1 on each listed FTP server.

Binary Snapshots:

As well, snapshots will be made available from time to time on the ftp mirrors. The snapshots are available on each of the FTP servers listed below, typically in the directory OpenBSD/snapshots. If you plan to use a snapshot, you should also read the general description about OpenBSD snapshots.

NOTE: you cannot fetch binaries directly from cvs.OpenBSD.org or OpenBSD.org but must use a mirror site. The main OpenBSD machines are on a little network pipe in Canada.

FTP:

• ftp://ftp.openbsd.org/pub/OpenBSD == ftp://ftp.eu.openbsd.org/pub/OpenBSD
  located in Switzerland.
• ftp://pub.seastrom.com/pub/OpenBSD == ftp://ftp1.usa.openbsd.org/pub/OpenBSD
  located in Virginia, Eastern USA.
  
• ftp://hydra.heuris.com/pub/OpenBSD == ftp://ftp2.usa.openbsd.org/pub/OpenBSD
  located in St. Louis, Missouri, mid-western USA.
  
• ftp://ftp.ibp.fr/pub/OpenBSD == ftp://ftp.fr.openbsd.org/pub/OpenBSD
  located in France.
  
• ftp://freestuff.cs.colorado.edu/pub/OpenBSD == ftp://ftp3.usa.openbsd.org/pub/OpenBSD
  located in Boulder, Colorado, western USA.
  
• ftp://alpha.ctaz.com/pub/OpenBSD == ftp://ftp5.usa.openbsd.org/pub/OpenBSD
  located in Arizona, western USA.
  
• ftp://ftp.op.net/pub/OpenBSD
  located in Pennsylvania, eastern USA.
  
• ftp://ftp.fu-berlin.de/pub/unix/openbsd/mirrors/OpenBSD == ftp://ftp.de.openbsd.org/pub/unix/openbsd/mirrors/OpenBSD
  located at the Free University, Berlin, GERMANY
• ftp://ftp.tut.ac.jp/OpenBSD == ftp://ftp.jp.openbsd.org/OpenBSD
  located at Toyohashi University of Technology, Aichi, JAPAN
• ftp://ftp.dti.ad.jp/pub/OpenBSD
  located at Dream Train Internet, JAPAN

The file structure of each FTP server is roughly:

• .../OpenBSD/2.1/
  -- where you find our most recent release. X11 is included if possible.

• .../OpenBSD/snapshots/
  -- for major architectures, we tend to build mini releases of unknown stability and quality about every month or so.p

• .../OpenBSD/src/
  -- a checkout of our daily source tree for those who want to access individual files. Normally we recommend the use of CTM or AnonCVS instead of mirroring this location.

• .../OpenBSD/tools/
  -- various other little bits..

People setting up new FTP mirrors will be interested in the following disk space usage estimates:

   315MB  2.0        (OpenBSD 2.0 release)
   500MB  2.1        (OpenBSD 2.1 release)
    27MB  domestic   (domestic distributions, i.e. hp300)
   500MB  snapshots  (current snapshots, normally >= 2.1 distribution size)
   244MB  src        (ftpable src tree, checked out from anoncvs nightly)
     1MB  tools      (helpful tools for OpenBSD stuff..) 
  --------------
   1.5GB  Total -- all collections

If you add a new FTP mirror site, please contact the FTP maintainer.