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In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org

The following mirrors should have the ISO images available:

http://mirror.clarkson.edu/centos/5.11/isos/x86_64/
http://holmes.umflint.edu/centos/5.11/isos/x86_64/
http://mirror.keystealth.org/centos/5.11/isos/x86_64/
http://mirrors.loosefoot.com/centos/5.11/isos/x86_64/
http://mirrors.rit.edu/centos/5.11/isos/x86_64/
http://centos.escapemg.com/5.11/isos/x86_64/
http://mirrors.mit.edu/centos/5.11/isos/x86_64/
http://mirror.nexcess.net/CentOS/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://mirrors.usc.edu/pub/linux/distributions/centos/5.11/isos/x86_64/
http://centos-mirror.jchost.net/5.11/isos/x86_64/
http://mirrors.cmich.edu/centos/5.11/isos/x86_64/
http://centos.chi.host-engine.com/5.11/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/5.11/isos/x86_64/
http://mirror.symnds.com/CentOS/5.11/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/5.11/isos/x86_64/
http://mirror.thelinuxfix.com/CentOS/5.11/isos/x86_64/

Mirrors Verified Mon Oct 20 11:05:53 2014 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission.

Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article : http://wiki.centos.org/AdditionalResources/Repositories