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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.scalabledns.com/centos/5.11/isos/x86_64/
http://yum.tamu.edu/centos/5.11/isos/x86_64/
http://mirror.pac-12.org/5.11/isos/x86_64/
http://mirror.hostduplex.com/centos/5.11/isos/x86_64/
http://ftp.linux.ncsu.edu/pub/CentOS/5.11/isos/x86_64/
http://denver.gaminghost.co/5.11/isos/x86_64/
http://mirror.cisp.com/CentOS/5.11/isos/x86_64/
http://centos.host-engine.com/5.11/isos/x86_64/
http://mirrors.unifiedlayer.com/centos/5.11/isos/x86_64/
http://mirror.fdcservers.net/centos/5.11/isos/x86_64/
http://mirror.jax.hugeserver.com/centos/5.11/isos/x86_64/
http://mirror.tzulo.com/centos/5.11/isos/x86_64/
http://mirror.lug.udel.edu/pub/centos/5.11/isos/x86_64/
http://centos.chi.host-engine.com/5.11/isos/x86_64/
http://mirror.eboundhost.com/CentOS/5.11/isos/x86_64/
http://mirror.sesp.northwestern.edu/centos/5.11/isos/x86_64/
http://ftpmirror.your.org/pub/centos/5.11/isos/x86_64/

Mirrors Verified Tue Mar 28 09:42:52 2017 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