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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://centos.chi.host-engine.com/5.11/isos/x86_64/
http://mirror.atlanticmetro.net/centos/5.11/isos/x86_64/
http://centos.escapemg.com/5.11/isos/x86_64/
http://mirror.lax.hugeserver.com/centos/5.11/isos/x86_64/
http://centos.eecs.wsu.edu/5.11/isos/x86_64/
http://mirrors.centos.webair.com/centos/5.11/isos/x86_64/
http://mirror.5ninesolutions.com/centos/5.11/isos/x86_64/
http://mirror-centos.hostingswift.com/centos/5.11/isos/x86_64/
http://mirrors.sonic.net/centos/5.11/isos/x86_64/
http://mirrors.einstein.yu.edu/centos/5.11/isos/x86_64/
http://mirror.chpc.utah.edu/pub/centos/5.11/isos/x86_64/
http://linux.cc.lehigh.edu/centos/5.11/isos/x86_64/
http://mirror.pac-12.org/5.11/isos/x86_64/
http://mirror.metrocast.net/centos/5.11/isos/x86_64/
http://mirror.cs.pitt.edu/centos/5.11/isos/x86_64/
http://mirrors.usinternet.com/centos/5.11/isos/x86_64/
http://mirror.cogentco.com/pub/linux/centos/5.11/isos/x86_64/

Mirrors Verified Tue Apr 21 02:38:51 2015 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